class A
{
private String name;
private String idstr;
public A(){}
A(String name,String idstr)
{
this.name=name;
this.idstr=idstr;
}
public boolean equals(Object obj)
{
if (shis==obj)
{
return true;
}
if(obj!=null&&(obj.getclass()).eqauls (A.class))
{
A AObj=(A)obj;
if((this.getidstr()).equals(Aobj.getidstr()))
{
return true;
}
}
return false;
}
}
public class B
{
public static void main(String[]args)
{
A p1=new A("孙悟空");
A p2=new Person("孙行者");
A p3=new A("孙悟饭");
System.out.println("p1,p2是否相等："+p1.equals(p2));
System.out.println("p2,p3是否相等："+p2.equals(p3));
}
}
------解决方案--------------------
我晕了，代码里面好多错啊，this写成shis， 私有成员变量，没有生成get，set方法，new对象时明明要传入两个参数，却只传入一个参数。。LZ先把那些最基础的东西搞明白吧。这样搞，会搞死人的。
------解决方案--------------------
我把你的修改了下，你自己看看，LS说的自动复写也可以，eclips有这样的功能。
- Java code
class A { private String name; private String idstr; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getIdstr() { return idstr; } public void setIdstr(String idstr) { this.idstr = idstr; } public A() { } A(String name, String idstr) { this.name = name; this.idstr = idstr; } public boolean equals(Object obj) { if (this == obj) { return true; } if (obj != null && (obj instanceof A)) { A AObj = (A) obj; System.out.println(AObj.idstr); if ((this.idstr).equals(AObj.idstr)) { return true; } } return false; }}public class B { public static void main(String[] args) { A p1 = new A("孙悟空", "shanghai"); A p2 = new A("孙行者", "xi'an"); A p3 = new A("孙悟饭", "shanghai"); System.out.println("p1,p2是否相等：" + p1.equals(p2)); System.out.println("p2,p3是否相等：" + p2.equals(p3)); System.out.println("p2,p3是否相等：" + p1.equals(p3)); }}
------解决方案--------------------
- Java code
class A { private String name; private String idstr; public A(String name){ this.name = name; } A(String name, String idstr) { this.name = name; this.idstr = idstr; } public boolean equals(Object obj) { if (this == obj) { return true; } if (obj != null && obj instanceof A) { A a = (A)obj; if (this.getName().equals(a.getName())){ return true; } } return false; } public String getIdstr() { return idstr; } public void setIdstr(String idstr) { this.idstr = idstr; } public String getName() { return name; } public void setName(String name) { this.name = name; }}class Person1 extends A{ public Person1(String name) { super(name); }}public class B { public static void main(String[] args) { A p1 = new A("孙悟空"); A p2 = new Person1("孙悟空"); A p3 = new A("孙悟饭"); System.out.println("p1,p2是否相等：" + p1.equals(p2)); System.out.println("p2,p3是否相等：" + p2.equals(p3)); }}//楼主好好打基础，基础不行，写代码会很累的。