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法律研究Java 程序用来区分字符串 == 运算符和 equals() 方法
在本文中，我们将了解如何在 Java 中区分 == 运算符和 equals() 方法。==（等于）运算符检查两个操作数的值是否相等，如果相等，则条件变为真。
equals() 方法将此字符串与指定的对象进行比较。当且仅当参数不为 null 且是表示与该对象相同的字符序列的 String 对象时，结果为 true。
以下是相同的演示 −
假设我们的输入是 −
The first string : abcde The second string: 12345
期望的输出是 −
Using == operator to compare the two strings: false Using equals() to compare the two strings: false
算法
Step 1 – START Step 2 - Declare two strings namely input_string_1, input_string_2 and two boolean values namely result_1, result_2. Step 3 - Define the values. Step 4 - Compare the two strings using == operator and assign the result to result_1. Step 5 - Compare the two strings using equals() function and assign the result to result_2. Step 5 - Display the result Step 6 - Stop
示例 1
这里，我们在“main”函数下将所有操作绑定在一起。
public class compare {
public static void main(String[] args) {
String input_string_1 = new String("abcde");
System.out.println("The first string is defined as: " +input_string_1);
String input_string_2 = new String("12345");
System.out.println("The second string is defined as: " +input_string_2);
boolean result_1 = (input_string_1 == input_string_2);
System.out.println("\nUsing == operator to compare the two strings: " + result_1);
boolean result_2 = input_string_1.equals(input_string_2);
System.out.println("Using equals() to compare the two strings: " + result_2);
}
}输出
The first string is defined as: abcde The second string is defined as: 12345 Using == operator to compare the two strings: false Using equals() to compare the two strings: false
示例 2
这里，我们将操作封装到函数中，展示面向对象编程。
public class Demo {
static void compare(String input_string_1, String input_string_2){
boolean result_1 = (input_string_1 == input_string_2);
System.out.println("\nUsing == operator to compare the two strings: " + result_1);
boolean result_2 = input_string_1.equals(input_string_2);
System.out.println("Using equals() to compare the two strings: " + result_2);
}
public static void main(String[] args) {
String input_string_1 = new String("abcde");
System.out.println("The first string is defined as: " +input_string_1);
String input_string_2 = new String("12345");
System.out.println("The second string is defined as: " +input_string_2);
compare(input_string_1, input_string_2);
}
}输出
The first string is defined as: abcde The second string is defined as: 12345 Using == operator to compare the two strings: false Using equals() to compare the two strings: false
更新于： 2022-03-29
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