參考鏈接： Java重寫equals方法

package com.bjpowernode.t01list;?

?import java.util.ArrayList;?

?/* * 向集合中添加自定義類型 */public class TestList04 {?

? public static void main(String[] args) { ArrayList list = new ArrayList(); Student s1 = new Student("1001","jack",19); Student s2 = new Student("1002","paul",20); Student s3 = new Student("1000","james",16); Student s4 = new Student("1006","wade",17); Student s6 = new Student("1006","wade",17); Student s5 = new Student("1008","curry",12); list.add(s4); list.add(s1); list.add(s2); list.add(s3); //判斷集合中是否包含傳入的對象 //contains方法底層實際上就是調用了對象的equals方法 //所以建議在自定義類型的時候要重寫equals方法 if(list.contains(s6)) { list.add(s5); } for(int i=0; i<list.size();i++) { System.out.println(list.get(i)); } }?

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轉載于:https://www.cnblogs.com/Koma-vv/p/9561615.html