Java - Statement for Statement

What is for statement?

A for loop statement is an iteration statement.

The general form of a for-loop statement is

for (initialization; condition-expression; expression-list)
      Statement

The initialization, condition-expression, and expression-list are separated by a semicolon.

A for-loop statement consists of four parts:

• Initialization
• Condition-expression
• Statement
• Expression-list

For example, the following for-loop statement will print all integers between 1 and 10, inclusive:

for(int num = 1; num <= 10; num++)
    System.out.println(num);

Demo

public class Main {
  public static void main(String[] args) {

    for (int num = 1; num <= 10; num++)
      System.out.println(num);/*from   w  w  w.ja va2 s  .c  o  m*/

  }
}

Result

• First, int num = 1 is executed.
• Variables declared in the initialization part of the for-loop statement can only be used within that for-loop statement.
• Then, condition-expression (num <= 10) is evaluated, which is 1 <= 10.
• It evaluates to true for the first time.
• Then, the body of for-loop statement is executed, which prints the current value of num.
• Then, the expression in the expression-list, num++, is evaluated, which increments the value of num by 1 .
• Now, the value of num becomes 2.
• Then the condition-expression 2 <= 10 is evaluated, which returns true.
• Then the current value of num is printed.
• This process continues until the value of num becomes 10.
• Then, num++ sets the value of num to 11, and the condition-expression 11 <= 10 returns false
• Then, the execution of the for-loop statement stops.

Related Topics

• for loop optional control
• for loop Initialization
• for loop Condition expression
• Use break statement to stop for-loop
• for loop Expression List
• counts how many words in a String
• Output tab character to create time table
• Loop an array backward
• Sum all element in an array using for loop
• Get the sum of square using an array
• Output numbers using for loop
• Print odd number using for loop
• Print number table
• Use forEach to display Object in a Set
• Generate 3 Letter Words
• displays a table of powers

Quiz

• What is the output: for(num = 1; num <= 10; System.out.println(++num));
• Write code to reverse a char array In Place
• Write code to reverse a string by appending its char element backward to a StringBuilder
• Write code to reverse Words in a String
• Print A Character Triangle
• Sum Numbers From 1 To N
• What is the output: for variables scope
• What is the output: for loop to create shape
• Get Smallest Of 3 Numbers using for loop

Example

• Print the 3 x 3 matrix
• Write code to Convert array To String using if and for loop
• Write code to Checks if the String contains any character in the given set of characters.
• Write code to Checks if a String is whitespace, empty ("") or null.
• Write code to count Occurrence of a char inside a string with for loop
• Write code to check if a string ends With Any other string in an array with for loop
• Write code to check if a string is Numeric via for loop and Character.isDigit() method
• Write code to get Char Count of a string using for loop and String.charAt() method
• Write code to convert byte array To Hex String with for loop and String.format()
• Write code to Removes any spaces within a string using if and for loop
• Write code to check if a string is Numeric using for loop
• Write code to create Line by repeating - using for loop
• Write code to create Spaces by repeating ' ' using for loop
• Write code to replace a string using for loop
• Write code to multiply a string with for loop and StringBuffer
• Write code to Convert camel Case To Dash with for loop
• Write code to generate String Of Length with for loop
• Write code to do string Reverse using for loop
• Write code to reverse a string using for loop
• Write code to split a string by substring method and for loop
• Write code to Returns true if the given character is a 'standard' character.
• Write code to get random Number
• Write code to count Words in a string
• Write code to generate random String
• Write code to check if a string is Numeric using for loop backward
• calculates the total of the numbers 1-100
• Print Square
• Write code to Print Z Figure

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