What are nested loops in Java?

A nested loop is a (inner) loop that appears in the loop body of another (outer) loop. The inner or outer loop can be any type: while, do while, or for. For example, the inner loop can be a while loop while an outer loop can be a for loop.

What is nested loop explain with example?

A nested loop has one loop inside of another. These are typically used for working with two dimensions such as printing stars in rows and columns as shown below. When a loop is nested inside another loop, the inner loop runs many times inside the outer loop.

Can we use while loop inside for loop in Java?

We can also create nested loops with while and do… while in a similar way. Note: It is possible to use one type of loop inside the body of another loop. For example, we can put a for loop inside the while loop.

Can you put a for loop in another for loop?

A for loop can contain any kind of statement in its body, including another for loop. – The inner loop must have a different name for its loop counter i bl th t it ill t fli t ith th t l variable so that it will not conflict with the outer loop.

How do you write nested for loops?

Nested loop means a loop statement inside another loop statement. That is why nested loops are also called as “loop inside loop“. Syntax for Nested Do-While loop: do{ do{ // statement of inside loop }while(condition); // statement of outer loop }while(condition);

How do you write a nested IF statement in Java?

nested if statement in java

  1. Syntax. The syntax for a nested if…else is as follows − if(Boolean_expression 1) { // Executes when the Boolean expression 1 is true if(Boolean_expression 2) { // Executes when the Boolean expression 2 is true } }
  2. Example. Live Demo.
  3. Output. X = 30 and Y = 10.

What is the syntax of nested loop?

How do you write a nested loop in Java?

How do nested while loops work in Java?

A nested while loop is a while statement inside another while statement. In a nested while loop, one iteration of the outer loop is first executed, after which the inner loop is executed. The execution of the inner loop continues till the condition described in the inner loop is satisfied.

In what situation you need a nested loop?

Nested loops are useful when for each pass through the outer loop, you need to repeat some action on the data in the outer loop. For example, you read a file line by line and for each line you must count how many times the word “the” is found.

How do you optimize a nested for loop in Java?

The rule is this: when writing nested loops make sure that the variables that change the most are in the most inner loop and those which change the least — in the most outer loop. This significantly reduces the number of jumps if the number of loops is big.