子类父类 构造器调用

class People {
String name;
public People() {
System.out.print(1);
}
public People(String name) {
System.out.print(2);
this.name = name;
}
}
class Child extends People {
People father;

public Child(String name) {
System.out.print(3);
this.name = name;
father = new People(name + ":F");
}
public Child() {
System.out.print(4);
}

}

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结果：132

总结：子类的构造器中没有super();无论子类构造器中有无参数都会去调用父类的无参构造函数，若父类没有无参构造函数则会报错！