<span class="token keyword">class</span> <span class="token class-name">Main</span> <span class="token punctuation">{</span>
  <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token punctuation">{</span>

<span class="token class-name">String</span> <span class="token punctuation">[</span><span class="token punctuation">]</span>animals<span class="token operator">=</span><span class="token keyword">new</span> <span class="token class-name">String</span><span class="token punctuation">[</span><span class="token number">4</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
animals<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token operator">=</span><span class="token string">"dog"</span><span class="token punctuation">;</span>
animals<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token operator">=</span><span class="token string">"cat"</span><span class="token punctuation">;</span>
animals<span class="token punctuation">[</span><span class="token number">2</span><span class="token punctuation">]</span><span class="token operator">=</span><span class="token string">"elephant"</span><span class="token punctuation">;</span>
animals<span class="token punctuation">[</span><span class="token number">3</span><span class="token punctuation">]</span><span class="token operator">=</span><span class="token string">"bird"</span><span class="token punctuation">;</span>

<span class="token comment">//print the first element of array:</span>
<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>animals<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">//for loop to print all elements of animals array</span>
<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span>i<span class="token operator">&lt;</span>animals<span class="token punctuation">.</span>length<span class="token punctuation">;</span>i<span class="token operator">++</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>animals<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token comment">//write java program that asks user to enter 10 numbers, and store it in array.</span>
        <span class="token comment">//then displays the array elements, highest number, lowest number, summation of numbers and average of numbers.</span>
        <span class="token class-name">Scanner</span> input<span class="token operator">=</span><span class="token keyword">new</span> <span class="token class-name">Scanner</span><span class="token punctuation">(</span><span class="token class-name">System</span><span class="token punctuation">.</span>in<span class="token punctuation">)</span><span class="token punctuation">;</span>
         <span class="token keyword">int</span> <span class="token punctuation">[</span><span class="token punctuation">]</span>numbers<span class="token operator">=</span><span class="token keyword">new</span> <span class="token keyword">int</span><span class="token punctuation">[</span><span class="token number">10</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
         <span class="token keyword">int</span> total <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
         <span class="token keyword">int</span> highest_number <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
         <span class="token keyword">int</span> lowest_number <span class="token operator">=</span> <span class="token number">999999</span><span class="token punctuation">;</span>
        <span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> i<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span>i<span class="token operator">&lt;</span><span class="token number">10</span><span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span>
        <span class="token punctuation">{</span>
            <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Please enter number: "</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            numbers<span class="token punctuation">[</span>i<span class="token punctuation">]</span> <span class="token operator">=</span> input<span class="token punctuation">.</span><span class="token function">nextInt</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            total <span class="token operator">=</span> total<span class="token operator">+</span>numbers<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">;</span>
            <span class="token keyword">if</span><span class="token punctuation">(</span>numbers<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token operator">&gt;</span>highest_number<span class="token punctuation">)</span>
                highest_number<span class="token operator">=</span>numbers<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">;</span>
            <span class="token keyword">if</span><span class="token punctuation">(</span>numbers<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token operator">&lt;</span>lowest_number<span class="token punctuation">)</span>
                lowest_number<span class="token operator">=</span>numbers<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
            <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Summation of numbers is: "</span> <span class="token operator">+</span> total<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Average of numbers is: "</span> <span class="token operator">+</span> total<span class="token operator">/</span><span class="token number">10</span> <span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Highest number is: "</span> <span class="token operator">+</span> highest_number<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Lowest number is: "</span> <span class="token operator">+</span> lowest_number<span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">//write java program: create an array of 4 elements called "animals" and put the names of animals inside it.</span>
  
            <span class="token comment">//solution 1: using the assignment statement directly.</span>
         <span class="token class-name">String</span> <span class="token punctuation">[</span><span class="token punctuation">]</span>animals1<span class="token operator">=</span> <span class="token punctuation">{</span><span class="token string">"dog"</span><span class="token punctuation">,</span><span class="token string">"cat"</span><span class="token punctuation">,</span><span class="token string">"elephant"</span><span class="token punctuation">,</span><span class="token string">"bird"</span><span class="token punctuation">}</span><span class="token punctuation">;</span>
  
<span class="token comment">//solution 2: assign the values later.</span>
<span class="token class-name">String</span> <span class="token punctuation">[</span><span class="token punctuation">]</span>animals2<span class="token operator">=</span><span class="token keyword">new</span> <span class="token class-name">String</span><span class="token punctuation">[</span><span class="token number">4</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
animals2<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token operator">=</span><span class="token string">"dog"</span><span class="token punctuation">;</span>
animals2<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token operator">=</span><span class="token string">"cat"</span><span class="token punctuation">;</span>
animals2<span class="token punctuation">[</span><span class="token number">2</span><span class="token punctuation">]</span><span class="token operator">=</span><span class="token string">"elephant"</span><span class="token punctuation">;</span>
animals2<span class="token punctuation">[</span><span class="token number">3</span><span class="token punctuation">]</span><span class="token operator">=</span><span class="token string">"bird"</span><span class="token punctuation">;</span>
  

<span class="token comment">//solution 3: using loops</span>
  
<span class="token class-name">Scanner</span> input<span class="token operator">=</span><span class="token keyword">new</span> <span class="token class-name">Scanner</span><span class="token punctuation">(</span><span class="token class-name">System</span><span class="token punctuation">.</span>in<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">String</span> <span class="token punctuation">[</span><span class="token punctuation">]</span>animals3<span class="token operator">=</span><span class="token keyword">new</span> <span class="token class-name">String</span><span class="token punctuation">[</span><span class="token number">4</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span> i<span class="token operator">&lt;</span><span class="token number">4</span><span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
    <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Please enter an animal name: "</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    animals3<span class="token punctuation">[</span>i<span class="token punctuation">]</span> <span class="token operator">=</span> input<span class="token punctuation">.</span><span class="token function">next</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>animals3<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token comment">//write java program that prompts user to enter the students names and specialties, then store it in a 2-dimensional array,</span>
    <span class="token comment">//the program should ask user about the number of students.</span>
    <span class="token comment">//finally print the elements of the array in a nice way.</span>
    <span class="token class-name">Scanner</span> input<span class="token operator">=</span><span class="token keyword">new</span> <span class="token class-name">Scanner</span><span class="token punctuation">(</span><span class="token class-name">System</span><span class="token punctuation">.</span>in<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"how many students you have ?"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">int</span> numberofstudents<span class="token operator">=</span>input<span class="token punctuation">.</span><span class="token function">nextInt</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">String</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">[</span><span class="token punctuation">]</span>students<span class="token punctuation">;</span>
    students<span class="token operator">=</span><span class="token keyword">new</span> <span class="token class-name">String</span><span class="token punctuation">[</span><span class="token number">2</span><span class="token punctuation">]</span><span class="token punctuation">[</span>numberofstudents<span class="token punctuation">]</span><span class="token punctuation">;</span>
    <span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> column<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span>column

<span class="token keyword">import</span> <span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span></span><span class="token class-name">Scanner</span><span class="token punctuation">;</span>
 
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">Main</span><span class="token punctuation">{</span>

    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token punctuation">{</span>

<span class="token comment">//برنامج لادارة وتخزين بيانات الموظفين في شركة, ضمن مصفوفة لاسماء الموظفين</span>
 <span class="token class-name">Scanner</span> input<span class="token operator">=</span><span class="token keyword">new</span> <span class="token class-name">Scanner</span><span class="token punctuation">(</span><span class="token class-name">System</span><span class="token punctuation">.</span>in<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">int</span> number_of_employees<span class="token punctuation">;</span>
        <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">print</span><span class="token punctuation">(</span><span class="token string">"How many employee SSNs you will enter?"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        number_of_employees<span class="token operator">=</span>input<span class="token punctuation">.</span><span class="token function">nextInt</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        
        <span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> employees_names<span class="token operator">=</span><span class="token keyword">new</span> <span class="token class-name">String</span><span class="token punctuation">[</span>number_of_employees<span class="token punctuation">]</span><span class="token punctuation">;</span>
  <span class="token comment">//entering employees data</span>
  <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i<span class="token operator">&lt;</span>number_of_employees<span class="token punctuation">;</span>i<span class="token operator">++</span><span class="token punctuation">)</span>
        <span class="token punctuation">{</span>
        <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">print</span><span class="token punctuation">(</span><span class="token string">"enter name of employee no."</span><span class="token operator">+</span><span class="token punctuation">(</span>i<span class="token operator">+</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        employees_names<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token operator">=</span>input<span class="token punctuation">.</span><span class="token function">next</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span> 
        <span class="token comment">//printing employees names:</span>
  <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">int</span> j <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> j<span class="token operator">&lt;</span>employees_names<span class="token punctuation">.</span>length<span class="token punctuation">;</span>j<span class="token operator">++</span><span class="token punctuation">)</span>
        <span class="token punctuation">{</span>
    <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>employees_names<span class="token punctuation">[</span>j<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span> 
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>