Iterating Statements

For Loop

This loop can be used for executing the statements multiple times. A for loop has to be used when we know the exact number of interations.

Syntax

for(initialization; condition; increment/decrement){
  statements;
}

Program

class ForDemo {
public static void main (String[] args) {
int n=6;
for (int i=1; i<=10; i++){
  system.out.println(n+"*"+i+"="+(n*i));
    }
  }
}

Rule1: All the three sections of the for loop are optional. If we do not specify any initialization and if do not specify any inc/dec, then the compiler will not specify any initialization and will not specify any inc/dec, but if we do not specify any condition then the complier will automatically specify a Boolean value true.

Rule2: Specifying the section separators(;) in a for loop are mandatory. for (;;) will execute for infinite times.

Rule3: In the for loop, initialization section and the inc/dnc section can contain any number of valid java statements, but the condition section must contain a value of only of Boolean type.

Rule4: The initialization section can contain multiple initializations separated by a comma(,) all should be of same time and the data type should be specified only one time.

Rule5: The condition section can contain any number of conditions, but they must be joined by using logical operators(& && | || ^)

Rule6: The inc/dec section can contain multiple increments or decrements but separated by a comma(,)

Rule7: If a variable is declared inside for loop, then it can be used only in that for loop.

Rule8: Specifying the { } is optional. If we don’t specify the { } then it will consider only one statement, and that one statement is mandatory. If we want to consider multiple statements then specifying the { } is mandatory. Within the { } we can specify any number of statements.