Java 程式用來區分字串 == 運算子和 equals() 方法
在本文中,我們將瞭解如何在 Java 中區分 == 運算子和 equals() 方法。==(等於)運算子檢查兩個運算元的值是否相等,如果相等,則條件變為真。
equals() 方法將此字串與指定的物件進行比較。當且僅當引數不為 null 且是表示與該物件相同的字元序列的 String 物件時,結果為 true。
以下是相同的演示 −
假設我們的輸入是 −
The first string : abcde The second string: 12345
期望的輸出是 −
Using == operator to compare the two strings: false Using equals() to compare the two strings: false
演算法
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
這裡,我們在“main”函式下將所有操作繫結在一起。
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);
}
}輸出
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
這裡,我們將操作封裝到函式中,展示面向物件程式設計。
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);
}
}輸出
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
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