package com.itheima.stu.exam;
class X {
Y b =new Y();
X(){
System.out.println("X");
}
}
class Y {
Y(){
System.out.println("Y");
}
}
publicclass Z extends X {
Y y =new Y();
Z(){
super();
System.out.println("Z");
}
publicstaticvoid main(String[] args){
new Z();
}
}
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