Sample of Java Pattern -- Singleton

Utils.java

package singleton;

public class Utils {
    
    private Utils(){}
    
    private static Utils instance = new Utils();
    
    public static Utils getInstance() {
        return instance;
    }
    
    public void println(String str){
        System.out.println(str);
    }

    public static void main(String[] args) {
        Utils.getInstance().println("Hello");
    }
}

you may download the source code.