java.tar.gz

Java

Java is a high-level, object-oriented language known for its portability and reliability. Mastering Java is key for developers to build scalable, secure software efficiently.

In this course, you will start by mastering the art of problem-solving with simple Java programs, such as the Bottle Filling example. You will learn how to structure your solutions, create execution sheets, and enhance your problem-solving abilities through practical exercises and quizzes. Progressing further, you will learn decision-making and branching in Java, understanding flowcharts, conditional expressions, and their application. You will also learn about Java basics, including the first Java program, fundamentals, conditional statements, and error categories, followed by in-depth lessons on working with Java strings and arrays. 

By the end of this course, you will have a solid understanding of Java programming fundamentals and the ability to solve real-world problems using Java.

Learn to Code: Java for Absolute Beginners

`String msg = "This string has text1 and text2 in it";`

`String msg = 'This string has text1 and text2 in it';`



`String msg = "This string has text1 " and " text2 in it";`



`String str1 = "This string has text1";`

`String str2 = " and text2 in it";`

`String msg = str1 + str2;`

**(Select all that apply.)** We want to store the following string in the variable `msg`. Which of the following shows the correct syntax in Java?

```text
This string has text1 and text2 in it
```

(Select all that apply.) We want to store the following string in the variable <code>msg</code>. Which of the following shows the correct syntax in Java?
<pre><code class="language-text">This string has text1 and text2 in it
</code></pre>

What is the result when the following program is executed?

```Java
class Test 
{
 public static void main(String args[]) 
 {
 char[] a = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i'};
 for (int i = 2; i < 6; i++)
 {
 System.out.print(a[i] + " ");
 }
 }
}
```

What is the result when the following program is executed?
<pre><code class="language-Java">class Test 
{
 public static void main(String args[]) 
 {
 char[] a = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i'};
 for (int i = 2; i &lt; 6; i++)
 {
 System.out.print(a[i] + &quot; &quot;);
 }
 }
}
</code></pre>

What is the output when the following program is executed?

```Java
class Test 
{
  public static void main(String args[]) 
  {   int a[] = {1,2,3,4,5,6,7,8,9};
      System.out.print(a[7] + " ");
      System.out.print(a[8] + " ");
      System.out.print(a[0] + " ");
      System.out.print(a[1] + " ");
  }
}
```


What is the output when the following program is executed?
<pre><code class="language-Java">class Test 
{
 public static void main(String args[]) 
 { int a[] = {1,2,3,4,5,6,7,8,9};
 System.out.print(a[7] + &quot; &quot;);
 System.out.print(a[8] + &quot; &quot;);
 System.out.print(a[0] + &quot; &quot;);
 System.out.print(a[1] + &quot; &quot;);
 }
}
</code></pre>

What is the output when the following program is executed?

```Java
class Test 
{
 public static void main(String args[]) 
 {
 char[] a = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i'};
 int i = 1; 
 while (i < 9)
 {
 System.out.print(a[i] + " ");
 i += 2;
 }
 }
}
```

What is the output when the following program is executed?
<pre><code class="language-Java">class Test 
{
 public static void main(String args[]) 
 {
 char[] a = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i'};
 int i = 1; 
 while (i &lt; 9)
 {
 System.out.print(a[i] + &quot; &quot;);
 i += 2;
 }
 }
}
</code></pre>

What is the result when the following program is executed?

```Java
class Test 
{
 public static void main(String args[]) 
 {
 String a = "abcdefghi";
 int i = 1; 
 while (i < 9)
 {
 System.out.print(a.charAt(i) + " ");
 i += 2;
 }
 }
}
```

What is the result when the following program is executed?
<pre><code class="language-Java">class Test 
{
 public static void main(String args[]) 
 {
 String a = &quot;abcdefghi&quot;;
 int i = 1; 
 while (i &lt; 9)
 {
 System.out.print(a.charAt(i) + &quot; &quot;);
 i += 2;
 }
 }
}
</code></pre>

What is the result when the following program is executed?

```Java
class Test 
{
 public static void main(String args[]) 
 {
 int[][] m = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
 int s = 0;
 int i = 0;
 int size = 3;
 int j = 0;
 while (i < size)
 {
 j=0;
 while (j < size)
 {
 s += m[j][i];
 j ++; 
 }
 System.out.print(s + " ");
 i++;
 }
 }
}
```

What is the result when the following program is executed?
<pre><code class="language-Java">class Test 
{
 public static void main(String args[]) 
 {
 int[][] m = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
 int s = 0;
 int i = 0;
 int size = 3;
 int j = 0;
 while (i &lt; size)
 {
 j=0;
 while (j &lt; size)
 {
 s += m[j][i];
 j ++; 
 }
 System.out.print(s + &quot; &quot;);
 i++;
 }
 }
}
</code></pre>

Test your knowledge of strings and arrays in Java.

About the Course

Problem Solving with Simple Programs

Decisions and Branching

Java Basics

Repetition with Loops

Strings and Arrays

Methods

Appendix - Complex Programs

Wrap Up

Quiz on Strings and Arrays