Java 语法 索引 ----- 构造函数(constructor)

重载

class MyRectangle{

    int x, y;

    public MyRectangle()             { x = 10; y = 20; }

    public MyRectangle(int a)        { x = a; y = a;   }

    public MyRectangle(int a, int b) { x = a; y = b;   }

}

 

Constructor chaining

public MyRectangle()             { this(10,20);  }

public MyRectangle(int a)        { this(a,a);    }

public MyRectangle(int a, int b) { x = a; y = b; }