Mega Code Archive
0060 for each loop
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The new version eliminates the loop counter.
The new syntax is:
for (type variable_name:array){
}
The type must be compatible with the array type.
public class Main {
public static void main(String args[]) {
String[] arr = new String[]{"rntsoft.com","a","b","c"};
for(String s:arr){
System.out.println(s);
}
}
}
The output:
rntsoft.com
a
b
c
Use for-each style for on a two-dimensional array.
public class Main {
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("Summation: " + sum);
}
}
The output from this program is shown here:
Value is: 1
Value is: 2
Value is: 3
Value is: 4
Value is: 5
Value is: 2
Value is: 4
Value is: 6
Value is: 8
Value is: 10
Value is: 3
Value is: 6
Value is: 9
Value is: 12
Value is: 15
Summation: 90
// Search an array using for-each style for.
public class Main {
public static void main(String args[]) {
int nums[] = { 6, 8, 3, 7, 5, 6, 1, 4 };
int val = 5;
boolean found = false;
// use for-each style for to search nums for val
for (int x : nums) {
if (x == val) {
found = true;
break;
}
}
if (found)
System.out.println("Value found!");
}
}
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