java构造函数重载this(true)

看storm的代码的时候，发现这样一句java代码， 很是不理解

google之后，发现原来是java语法中，构造函数重载，this()调用的其实就是 构造函数。This is constructor overloading:

this(); is constructor which is used to call another constructor in a class, for example:-

https://stackoverflow.com/questions/15867722/what-does-this-method-mean/15867769

java的构造函数重载

construct overloading:

public class Test{

    Test(){
        this(10);  // calling constructor with one parameter
        System.out.println("This is Default Constructor");
    }

    Test(int number1){
        this(10,20);   // calling constructor with two parameter
        System.out.println("This is Parametrized Constructor with one argument "+number1);
    }

    Test(int number1,int number2){
        System.out.println("This is Parametrized  Constructor  with two argument"+number1+" , "+number2);
    }

    public static void main(String args[]){
        Test t = new Test();
        // first default constructor,then constructor with 1 parameter , then constructor with 2 parameters will be called
    }

}

　　上述代码运行结果如下：