What is For-Each Loop?

• The For-Each Version of the for Loop :
• It is a new and second form of for loop.
• A for-each stype loop is designed to cycle through a collection of objects, such as an array, in strictly sequential fashion, from start to finish.

Use a for-each style for loop.

class MyForEach { 
  public static void main(String args[]) { 
    int nums[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }; 
    int sum = 0; 
 
    // use for-each style for to display and sum the values
    for(int x : nums) { 
      System.out.println("Value is: " + x);
      sum += x; 
    } 
     System.out.println("Summation: " + sum);
  } 
}

The for-each loop is essentially read-only.

class WithNoChange {  
  public static void main(String args[]) {  
    int nums[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };  
 
    for(int x : nums) {  
      System.out.print(x + " "); 
      x = x * 10; // no effect on nums
    }  
   
    System.out.println();
 
    for(int x : nums) 
      System.out.print(x + " "); 
 
    System.out.println();
  }  
}

Use for-each style for on a two-dimensional array.

class MyForEach3 { 
  public static void main(String args[]) { 
    int sum = 0; 
    int nums[][] = new int[3][5]; 
 
    // give nums some values 
    for(int i = 0; i < 3; i++)  
      for(int j=0; j < 5; j++) 
        nums[i][j] = (i+1)*(j+1); 
 
    // use for-each for to display and sum the values 
    for(int x[] : nums) { 
      for(int y : x) {
        System.out.println("Value is: " + y); 
        sum += y; 
      }
    } 
    System.out.println("Sum is  : " + sum); 
  } 
}