Loops in java With Example Code

 

LOOPS IN JAVA WITH EXAMPLE CODE

In programming languages, loops are used to execute a set of instructions/functions repeatedly when some conditions become true. There are three types of loops in Java.

• for loop
• while loop
• do-while loop

Java For Loop vs While Loop vs Do While Loop

Java For Loop

The Java for loop is used to iterate a part of the program several times. If the number of iteration is fixed, it is recommended to use for loop.

There are three types of for loops in java.

• Simple For Loop
• For-each or Enhanced For Loop
• Labeled For Loop

Example:

01. Simple For Loop

1. //Java Program to demonstrate the example of for loop  
2. //which prints table of 1  
3. public class ForExample {  
4. public static void main(String[] args) {  
5.     //Code of Java for loop  
6.     for (int i=1;i<=10;i++){  
7.         System.out.println(i);  
8.     }  
9. }  
10. } 

Output:

1
2
3
4
5
6
7
8
9
10

02. For-each or Enhanced For Loop

1. //Java For-each loop example which prints the  
2. //elements of the array  
3. public class ForEachExample {  
4. public  static void main(String[] args) {  
5.     //Declaring an array  
6.     int arr[]={12,23,44,56,78};  
7.     //Printing array using for-each loop  
8.     for(int i:arr){  
9.         System.out.println(i);  
10.     }  
11. }  
12. } 

Output:

12
23
44
56
78

03. Labeled For Loop

1. //A Java program to demonstrate the use of labeled for loop  
2. public class LabeledForExample {  
3. public static void main(String[] args) {  
4.     //Using Label for outer and for loop  
5.     aa:  
6.         for(int i=1;i<=3;i++){  
7.             bb:  
8.                 for(int j=1;j<=3;j++){  
9.                     if(i==2&&j==2){  
10.                         break aa;  
11.                     }  
12.                     System.out.println(i+" "+j);  
13.                 }  
14.         }  
15. }  
16. }

Output:

1 1
1 2
1 3
2 1

Java While Loop

The Java while loop is used to iterate a part of the program several times. If the number of iteration is not fixed, it is recommended to use while loop.

1. public class WhileExample {  
2. public static void main(String[] args) {  
3.     int i=1;  
4.     while(i<=10){  
5.         System.out.println(i);  
6.     i++;  
7.     }  
8. }  
9. }  

Output:

1
2
3
4
5
6
7
8
9
10

Java do-while Loop

The Java do-while loop is used to iterate a part of the program several times. If the number of iteration is not fixed and you must have to execute the loop at least once, it is recommended to use do-while loop.

The Java do-while loop is executed at least once because condition is checked after loop body.

1. public class DoWhileExample {  
2. public static void main(String[] args) {  
3.     int i=1;  
4.     do{  
5.         System.out.println(i);  
6.     i++;  
7.     }while(i<=10);  
8. }  
9. } 

Output:

1
2
3
4
5
6
7
8
9
10

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