Java Program for String Contains or Not Example

Java Program to check whether string contains or not

Reads the string using Scanner class and nextLine method from java.util package and finds whether user input search string is part of sentence string in java program.

Java string method indexOf is used here to check whether string contains or not since indexOf method returns the string matching starting position index value in the main string 'sentence' variable.

If does not contains the string, returns -1.

import java.util.Scanner;

class StringContainsTest{
	public static void main(String[] args){
		String sentence = "Welcome to learn java!";
		System.out.print("Enter string to search: ");
		Scanner sc=new Scanner(System.in); 
		String findStr = sc.nextLine();
		sc.close();
		if (sentence.indexOf(findStr) >= 0){
			System.out.println("Sentence '"+sentence+"' contains the substring '"+findStr+"'");
		} else {
			System.out.println("Sentence '"+sentence+"' does not contain the substring '"+findStr+"'");
		}
	}
}

D:\Java_Programs>javac StringContainsTest.java
D:\Java_Programs>java StringContainsTest

Enter string to search: learn
Sentence 'Welcome to learn java!' contains the substring 'learn'


D:\Java_Programs>javac StringContainsTest.java
D:\Java_Programs>java StringContainsTest

Enter string to search: not
Sentence 'Welcome to learn java!' does not contain the substring 'not'