What is the difference between String, StringBuilder and StringBuffer?

Point	String	StringBuilder	StringBuffer
Changeable	No (immutable)	Yes	Yes
Thread safe	Yes (immutable)	No	Yes (synchronized)
Speed	Slow for many joins	Fastest	Slower than StringBuilder
Use for	Fixed text	Building text in a loop	Old code with many threads

public class Main {
    public static void main(String[] args) {
        StringBuilder sb = new StringBuilder("Java");
        sb.append(" is").append(" fun");
        System.out.println(sb);
        System.out.println(sb.reverse());
    }
}

Details: Java StringBuilder and Text Blocks.

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