public class A {
A(){}
A(String name){
this.name = name ;
}
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
public class B{
public static void main(String[] args){
A a1= new A("张三");
}
}
一二给你写了剩下的自己写, 这些都是基础