$show=/label

Java For loop Examples - Nested For Loop Examples

SHARE:

Learn Java for loop, For loop example in Java, For loop types in Basic for loop (Old style) and Enhanced for loop (For-each or for-in loop), Inner for loop or nested for loop example.

For Loop in Java:

In java, for-loop has two versions.

1) Basic for loop (Old style)
2) Enhanced for loop (For-each or for-in loop)


First, we will discuss basic for loop then next discuss Enhanced loop.
The enhanced loop is designed mainly for Arrays or Collection. We will discuss this in the next tutorial.

Enhanced for loop and Examples.

Java For loop, Examples

Basic for loop:

The basic loop has the flexibility to use it as per our needs. This is very useful if we know how many times it needs to be executed.

It has three sections.

1) Variable declaration and its initialization
2) Condition: Untill condition is true, the loop will be executed.
3) Variable increment/decrement

Syntax:

for(declaration ; condition ; increment/decrement)
{
    // some repetited code here
}


All these three are separated by a semicolon (;).

Rules:

1) Declarations can be multiple and are separated by comma(,).
2) The condition should be only one. This can be a logical expression or function which returns boolean.
3) Multiple Increment/Decrement statements are allowed and separated by comma(,).
4) All these sections are optional but there should be semicolons.
5) Variables declared inside for loop are not accessible outside its loop. The scope is only limited to for loop.
6) All variables must be the same data type.

For loop execution:


First initializes the variables
Second checks the condition. if condition is true then executes the statements inside loop.
Third increemnt or decreemnt variable
Then repeats the second and third points untill condition is false.

For loop Examples:


package com.java.s3schools.switchdemo;
public class ForLoopExample {
    public static void main(String[] args) {
        for (int i = 1; i <= 10; i++) {
            System.out.println("i value : " + i);
        }
    }
}

Output:

i value : 1
i value : 2
i value : 3
i value : 4
i value : 5
i value : 6
i value : 7
i value : 8
i value : 9
i value : 10

More about:

If , If-else, nested if else condition in java

While loop in java, Examples

Switch Statement in java

Inner For loop or Nested loop example:



package com.java.s3schools.switchdemo;

public class InnerForLoopExample {
    public static void main(String[] args) {
        for (int i = 1; i <= 3; i++) {
            for (int j = 1; j <= 5; j++) {
                System.out.println("i value :: " + i + ", j value :: " + j);
            }
            System.out.println("-----------------------------");
        }
    }
}


Output:

i value :: 1, j value :: 1
i value :: 1, j value :: 2
i value :: 1, j value :: 3
i value :: 1, j value :: 4
i value :: 1, j value :: 5
-----------------------------
i value :: 2, j value :: 1
i value :: 2, j value :: 2
i value :: 2, j value :: 3
i value :: 2, j value :: 4
i value :: 2, j value :: 5
-----------------------------
i value :: 3, j value :: 1
i value :: 3, j value :: 2
i value :: 3, j value :: 3
i value :: 3, j value :: 4
i value :: 3, j value :: 5
-----------------------------

Drawbacks of For loop:


The following are drawbacks for basic for loop which makes the code less readable and all are legal to use.

1) As mentioned in the variable declaration, condition, increment variables are optional. If we remove these three then the loop becomes an infinite loop.
for ( ; ; )
{
    System.out.println("inside loop")
}


2) If variable initialization is done outside for loop then it looks like a while loop.

int i=0;

for ( ; i <= 10 ;)
{
    i++;
    // code here
}


3) In the increment/decrement section, we can write any code as following.

int i=1;

for( ; i < 3; System.out.println("loop...."))
{
    i++;
}


Output:

loop....
loop....

All these drawbacks are fixed by enhanced for loop.

Next, will see For each loop in java, Enhanced loop in java, Enhanced loop Example.
 

COMMENTS

BLOGGER

About Us

Author: Venkatesh - I love to learn and share the technical stuff.
Name

accumulo,1,ActiveMQ,2,Adsense,1,API,37,ArrayList,18,Arrays,24,Bean Creation,3,Bean Scopes,1,BiConsumer,1,Blogger Tips,1,Books,1,C Programming,1,Collection,8,Collections,37,Collector,1,Command Line,1,Comparator,1,Compile Errors,1,Configurations,7,Constants,1,Control Statements,8,Conversions,6,Core Java,149,Corona India,1,Create,2,CSS,1,Date,3,Date Time API,38,Dictionary,1,Difference,2,Download,1,Eclipse,3,Efficiently,1,Error,1,Errors,1,Exceptions,8,Fast,1,Files,17,Float,1,Font,1,Form,1,Freshers,1,Function,3,Functional Interface,2,Garbage Collector,1,Generics,4,Git,9,Grant,1,Grep,1,HashMap,2,HomeBrew,2,HTML,2,HttpClient,2,Immutable,1,Installation,1,Interview Questions,6,Iterate,2,Jackson API,3,Java,32,Java 10,1,Java 11,6,Java 12,5,Java 13,2,Java 14,2,Java 8,128,Java 8 Difference,2,Java 8 Stream Conversions,4,java 8 Stream Examples,12,Java 9,1,Java Conversions,14,Java Design Patterns,1,Java Files,1,Java Program,3,Java Programs,114,Java Spark,1,java.lang,4,java.util. function,1,JavaScript,1,jQuery,1,Kotlin,11,Kotlin Conversions,6,Kotlin Programs,10,Lambda,2,lang,29,Leap Year,1,live updates,1,LocalDate,1,Logging,1,Mac OS,3,Math,1,Matrix,6,Maven,1,Method References,1,Mockito,1,MongoDB,3,New Features,1,Operations,1,Optional,6,Oracle,5,Oracle 18C,1,Partition,1,Patterns,1,Programs,1,Property,1,Python,2,Quarkus,1,Read,1,Real Time,1,Recursion,2,Remove,2,Rest API,1,Schedules,1,Serialization,1,Servlet,2,Sort,1,Sorting Techniques,8,Spring,2,Spring Boot,23,Spring Email,1,Spring MVC,1,Streams,31,String,61,String Programs,28,String Revese,1,StringBuilder,1,Swing,1,System,1,Tags,1,Threads,11,Tomcat,1,Tomcat 8,1,Troubleshoot,26,Unix,3,Updates,3,util,5,While Loop,1,
ltr
item
JavaProgramTo.com: Java For loop Examples - Nested For Loop Examples
Java For loop Examples - Nested For Loop Examples
Learn Java for loop, For loop example in Java, For loop types in Basic for loop (Old style) and Enhanced for loop (For-each or for-in loop), Inner for loop or nested for loop example.
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgJYlLZEEkRWw9JGON390Lh3UaLv6v1euSxRcPL2aS74PNWJbKbRRjTAxNvnfiPx7G3MAspEFIe-g5cmhkizbP6KwQqp1JMX1zCGfN9hi7rQs7SZ7PlsvNeJyQxnRkmWXPtn8pw77yWAWY/w640-h280/Java+For+loop.png
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgJYlLZEEkRWw9JGON390Lh3UaLv6v1euSxRcPL2aS74PNWJbKbRRjTAxNvnfiPx7G3MAspEFIe-g5cmhkizbP6KwQqp1JMX1zCGfN9hi7rQs7SZ7PlsvNeJyQxnRkmWXPtn8pw77yWAWY/s72-w640-c-h280/Java+For+loop.png
JavaProgramTo.com
https://www.javaprogramto.com/2017/09/java-for-loop-examples-nested-for-loop.html
https://www.javaprogramto.com/
https://www.javaprogramto.com/
https://www.javaprogramto.com/2017/09/java-for-loop-examples-nested-for-loop.html
true
3124782013468838591
UTF-8
Loaded All Posts Not found any posts VIEW ALL Readmore Reply Cancel reply Delete By Home PAGES POSTS View All RECOMMENDED FOR YOU LABEL ARCHIVE SEARCH ALL POSTS Not found any post match with your request Back Home Sunday Monday Tuesday Wednesday Thursday Friday Saturday Sun Mon Tue Wed Thu Fri Sat January February March April May June July August September October November December Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec just now 1 minute ago $$1$$ minutes ago 1 hour ago $$1$$ hours ago Yesterday $$1$$ days ago $$1$$ weeks ago more than 5 weeks ago Followers Follow THIS PREMIUM CONTENT IS LOCKED STEP 1: Share to a social network STEP 2: Click the link on your social network Copy All Code Select All Code All codes were copied to your clipboard Can not copy the codes / texts, please press [CTRL]+[C] (or CMD+C with Mac) to copy Table of Content