【0712作业】重写equals

 

package student01;
/**
 * 重写equals
 * 2019-07-13
 * @author L
 *
 */
public class Student {
      private String name;
        private int id;
        private int age;
        
        public String getName() {
            return name;
        }
        public void setName(String name) {
            this.name = name;
        }
        public int getId() {
            return id;
        }
        public void setId(int id) {
            this.id = id;
        }
        public int getAge() {
            return age;
        }
        public void setAge(int age) {
            this.age = age;
        }
        public Student() {}
        public Student(String name, int id, int age) {
            super();
            this.name = name;
            this.id = id;
            this.age = age;
        }
        
        public boolean equals(Object ob) {
            //自反性
            if(this==ob){
                return true;
            }
            //instanceof比较判断是否是同一类或者子父类关系
            if(! (ob instanceof Student)){
                return false;
            }
            //判断是同一类或者子父类关系，再将Object类型强转为Student
            Student ob1 = (Student)ob;
            if(this.id == ob1.id && this.name.equals(ob1.name)) {
                return true;
            }else {
                return false;
            }
            
            
        }
        
    }

测试

package student01;

public class Main {
     public static void main(String[] args) {
            Student student1 = new Student("张三",01,18);
            Student student2 = new Student("李四",02,17);
            Student student3 = new Student("张三",01,17);
            boolean a1 = student1.equals(student2);
            boolean a2 = student1.equals(student3);
            System.out.println("student1.equals(student2)为"+a1+"\n"+"student1.equals(student3)为"+a2);
        }
}