Java比较两个对象是否相等的方法

String str1 = "hello";
String str2 = "world";
String str3 = "hello";

boolean equals = ObjectUtils.nullSafeEquals(str1, str3); // 使用 Apache Commons Lang 库

Integer num1 = 42;
Integer num2 = 42;
Integer num3 = null;

boolean equals = ObjectUtils.nullSafeEquals(num1, num2); // 使用 Apache Commons Lang 库

List<String> list1 = Arrays.asList("a", "b", "c");
List<String> list2 = Arrays.asList("a", "b", "c");
List<String> list3 = null;

boolean equals = ObjectUtils.nullSafeEquals(list1, list2); // 使用 Apache Commons Lang 库

class Person {
    private String name;
    private int age;

    // ... getters and setters ...

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Person person = (Person) o;
        return age == person.age &&
                Objects.equals(name, person.name);
    }

    @Override
    public int hashCode() {
        return Objects.hash(name, age);
    }
}

Person person1 = new Person("Alice", 30);
Person person2 = new Person("Alice", 30);
Person person3 = null;

boolean equals = ObjectUtils.nullSafeEquals(person1, person2); // 使用 Apache Commons Lang 库

import cn.hutool.core.util.ObjectUtil;

public class HutoolEqualsExample {
    public static void main(String[] args) {
        String str1 = "hello";
        String str2 = "world";
        String str3 = "hello";
        String str4 = null;

        boolean equals = ObjectUtil.equals(str1, str3); // 比较str1和str3
        boolean notEquals = ObjectUtil.equals(str1, str2); // 比较str1和str2
        boolean nullSafe = ObjectUtil.equals(str1, str4); // 比较str1和null

        System.out.println("Equals: " + equals); // 输出 true
        System.out.println("Not Equals: " + notEquals); // 输出 false
        System.out.println("Null Safe: " + nullSafe); // 输出 false
    }
}

<dependency>
    <groupId>cn.hutool</groupId>
    <artifactId>hutool-all</artifactId>
    <version>5.7.16</version> <!-- 请使用最新的版本 -->
</dependency>