介于==和之间的差值。Java 中的 equals()方法
原文:https://www . geeksforgeeks . org/difference-and-equals-method-in-Java/
在 Java 中，equals()方法和==运算符都用于比较两个对象。==是运算符，equals()是方法。但是==运算符比较堆中对象的引用或内存位置，不管它们是否指向同一个位置。
每当我们使用运算符 new 创建一个对象时，它都会为该对象创建一个新的内存位置。因此，我们使用==运算符来检查两个对象的内存位置或地址是否相同。
一般来说，Java 中的 equals()和" == "运算符都是用来比较对象来检查相等性的，但是这里有两者之间的一些区别:
- The main difference between. The equals () method and the = = operator are one method and the other operator.
- We can use the = = operator for reference comparison ( address comparison ) and. The equals () method is used for content comparison . Simply put, = = Check whether two objects point to the same memory location. Equals () calculates the comparison of values in objects.
- If a class does not have to override the equals method , then by default, it uses the equals(Object o) method of the nearest parent class that has already overridden the method. See Why do you want to override the equals (object) and hashCode () methods? Detailed.
Java
// Java program to understand
// the concept of == operator
public class Test {
public static void main(String[] args)
{
String s1 = "HELLO";
String s2 = "HELLO";
String s3 = new String("HELLO");
System.out.println(s1 == s2); // true
System.out.println(s1 == s3); // false
System.out.println(s1.equals(s2)); // true
System.out.println(s1.equals(s3)); // true
}
}
输出
true
false
true
true
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