For Loop in Java
The for loop in Java runs for a fixed number of times. In other words, loop which executes a set of statements a fixed number of times is known as a for loop. for loop is an entry-controlled loop. That means decision whether the loop will run or not is taken at the beginning of the loop.
A for loop has three parts:
- Initialization Expression
- Test/Conditional Expression
- Update Expression
The variable used in a for loop is known as a loop variable.
The for loop can be used in three different ways:
Single line loop
for(i = 1; i <= 10000; i++);Two line loop
for(i = 1; i <= 10; i++) System.out.print( i + " ");Multi-line loop
for( i = 1; i <= 10; i++){ a = i + 2; System.out.print(a + " "); }
The for loop can be used to generate series, patterns, traverse an array or simply repeat certain statements for a specified number of times. Following is a simple program to generate squares of natural numbers up to 10 terms.
class NaturalSquares{
public static void main(String args[]){
int i, a;
for(i = 1; i <= 10; i++){
a = i * i;
System.out.print(a+" ");
}//end of loop
}//end of main
}//end of class
