ArrayList容器中怎么根据输出Id删除对象元素
People.java

Java code

public class People {    private  int id;//联系人id       private String name;//联系人姓名       private String pass;//联系人密码       private  String num;//联系人电话    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public String getPass() {        return pass;    }    public void setPass(String pass) {        this.pass = pass;    }    public String getNum() {        return num;    }    public void setNum(String num) {        this.num = num;    }        public People(int id,String name,String pass,String num){        this.id=id;        this.name=name;        this.pass=pass;        this.num=num;    }}

[解决办法]
方法正确 要在People中重写一下 equals方法
在People类中加如下代码

Java code

    @Override    public boolean equals(Object obj) {        if(obj == null) {            return false;        } else if(obj.getClass() == this.getClass()) {            People p = (People)obj;            return p.id == this.id;        }        return false;    }    @Override    public int hashCode() {        int type = this.getClass().hashCode();        return id + type*41;    }