Java – Difference between String VS StringBuffer | Code Factory

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• String objects are immutable, not changed
• StringBuffer objects are mutable, changed
• After creating String object, it can not be changed but in StringBuffer it can be easily changed.

package com.example.string;

public class Test {
	public static void main(String... args) {
		String s = new String("Code");
		s.concat("Factory");
		System.out.println(s); // Code
		
		String s1 = s.concat("Factory");
		System.out.println(s1);	// CodeFactory
	}
}

package com.example.string;

public class Test {
	public static void main(String... args) {
		StringBuffer sb = new StringBuffer("Code");
		sb.append("Factory");
		System.out.println(sb); // CodeFactory
	}
}