继承

父类：

package com.poke.inherited;

public class SuperClass {

private int fieldA;

public SuperClass(){
this(5);
System.out.println("父类构造1");
}

public SuperClass(int a){
this(5,6);
System.out.println("父类构造2");
}

public SuperClass(int a, int b){
System.out.println("父类构造3");
}

public void methodA(){
System.out.println("来自父类的A方法");
}

}

子类：

package com.poke.inherited;

public class SubClass extends SuperClass {

public int fieldB;

public SubClass(){
super();
System.out.println("子类构造1");
}

public SubClass(int a){
this();
System.out.println("子类构造2");
}

public SubClass(int a, int b){
this(a);
System.out.println("子类构造3");
}

public void methodB(){
System.out.println("来自子类的B方法");
}

}

测试：

package com.poke.inherited;

public class TestExtend {

/**
* @param args
*/
public static void main(String[] args) {

SubClass sub = new SubClass(10,5);

}

}

输出：

父类构造3

父类构造2

父类构造1

子类构造1

子类构造2

子类构造3