List去掉重复对象

去掉重复对象使用Set排重

public class Bean {

    public int uid;
    public String name;

    public Bean(int uid, String name) {
        this.uid = uid;
        this.name = name;
    }

    @Override
    public boolean equals(Object obj) {
        if (obj instanceof Bean) {
            return ((Bean) obj).uid == this.uid;
        }
        return super.equals(obj);
    }

    @Override
    public int hashCode() {
        return uid;
    }
}

测试

public class Main {

    private static Set<Bean> mBeans = new HashSet<>();

    public static void main(String[] args) {
        mBeans.add(new Bean(10, "Andy"));
        mBeans.add(new Bean(12, "Andy"));
        mBeans.add(new Bean(15, "Andy"));
        mBeans.add(new Bean(10, "Andy"));

        for (Bean bean : mBeans) {
            System.out.println(bean.uid + "/" + bean.name);
        }
    }
}

输出

10/Andy
12/Andy
15/Andy