String methods – Concat and contains

In this post, we will see 2 string methods which are  concat and contains.

String concat(String str):

The method appends a specified string to the end of this string.

If the length of the string is 0, after concatenating a new string will return. We can concatenate multiple strings as well as shown in the code below.

public class StringMethodsEx {

	public static void main(String[] args) {
		
		String val1 = "Hello world!!";
		String val2 = "";
		
		System.out.println(val2.concat("New string object"));  // new string
		System.out.println(val1.concat("How ").concat("are ").concat("you."));
	}
}

boolean contains(CharSequence s):

This method finds the sequence of characters in the any string and returns true if matches ,else false.

public class StringMethodsEx {

	public static void main(String[] args) {
		
		String val1 = "Hello world!!";
		
		System.out.println(val1.contains("Hello"));  //returns true
		System.out.println(val1.contains("Universe"));  //returns false
		
	}
}