Loop Control Statements in Java Programming Language

Loop Control Statements in Java Programming Language

Loop Control Statements in Java are used to execute a particular code several.Statements are executed sequentially, and once the condition tests false,the loop is exited.

Types of Loop Control Statements in Java:

There are three types of Loop Control Statements in java.

• 1.Java for loop
• 2.Java for each loop also know as enhanced for loop.
• 3.Labeled for loop

Java for Loop 

Java for loop is just like C++ for loop if you're familiar with the language

Syntax 

 for(variable initialization;condition to be tested;increment or decrement the variable)  
 {  
 //if condition is true,execute this code  
 }  

Example:

public class JavaForLoop {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        for(int marks=0;marks<=10;marks++)
        {
        
        System.out.println("Mark  is "+marks);
        }
        
  

Output

 Mark is 0  
 Mark is 1  
 Mark is 2  
 Mark is 3  
 Mark is 4  
 Mark is 5  
 Mark is 6  
 Mark is 7  
 Mark is 8  
 Mark is 9  
 Mark is 10  
 BUILD SUCCESSFUL (total time: 0 seconds)  

Java for each loop

For each loop in java is used to iterate through an array or collections likes lists etc:Arrays elements are used instead of index.

Syntax:

 for(certain variable:array/collection)  
 {  
 //execute this code block  
 }  

Example:

 
public class ForeachLoop {
    
    public static void main(String args[])
    {
    int marks[]={22,11,33,44,55,66,77,88,76,23,12,16};//initialize array
     for(int a:marks)
     {
         System.out.println("Mark  is "+a);
     }
    
    }
    
}

Output:

 Mark is 22  
 Mark is 11  
 Mark is 33  
 Mark is 44  
 Mark is 55  
 Mark is 66  
 Mark is 77  
 Mark is 88  
 Mark is 76  
 Mark is 23  
 Mark is 12  
 Mark is 16  

Labeled for Loop

Labeled for loop uses break and continue keywords to get out of the inner loop:

Syntax:

 labeledname;   
 for(initialize variable;test condition;increment or decrement variable){   
 // executed this code if true   
 }   

Example:

 
public class LabeledForLoopExample {
    
    public static void main(String args[])
    {
        kk:
        
    
  for(int i=1;i<=3;i++){  
            dd:  
                for(int j=1;j<=3;j++){  
                    if(i==2&&j==2){  
                        break kk;  
                    }  
                    System.out.println(i+" "+j);  
                }  
        }  
}  
}  

Output:

 1 1  
 1 2  
 1 3  
 2 1  
 BUILD SUCCESSFUL (total time: 0 seconds)  

if the above code we used break dd, execution of inner loop would stop but continue with the outer loop.

Example:

 
public class LabeledForLoopExample {
    
    public static void main(String args[])
    {
        kk:
        
    
  for(int i=1;i<=3;i++){  
            dd:  
                for(int j=1;j<=3;j++){  
                    if(i==2&&j==2){  
                        break dd;  
                    }  
                    System.out.println(i+" "+j);  
                }  
        }  
}  
}  




Output:

 run:  
 1 1  
 1 2  
 1 3  
 2 1  
 3 1  
 3 2  
 3 3  
 BUILD SUCCESSFUL (total time: 0 seconds)  

Infinitive For Loop

To create an infinitive for loop,we use two semicolons;;

Syntax:

 for(;;){   
 //execution code    
 }   

 
public class InfinitiveLoop {

   

    public static void main(String args[])

    {

    for(;;)

    {

    System.out.println("Infinitive loop Example");

    }

       

    }   

}

Output:

 Infinitive loop Example  
 Infinitive loop Example  
 Infinitive loop Example  
 Infinitive loop Example  
 Infinitive loop Example  
 Infinitive loop Example  
 Infinitive loop Example  
 Infinitive loop Example  
 Infinitive loop Example  
 Infinitive loop ExampleBUILD STOPPED (total time: 2 seconds)