Java Character isLowSurrogate() 方法

6 Nov 2024 | 3 分钟阅读

Character 类的 isLowSurrogate(char ch) 方法用于确定给定的（或指定的）字符是否为 Unicode 低代理码单元（也称为尾部代理码单元）。

这些值本身不代表字符，而是用于在 UTF-26 编码中表示补充字符。

语法

参数

ch：需要测试的字符。

返回值

isLowSurrogate(char ch) 方法返回一个布尔值，即如果给定的（或指定的）字符介于 MIN_LOW_SURROGATE 和 MAX_LOW_SURROGATE 之间，则返回 true。否则，该方法返回 false。

示例 1

public class JavaCharacterIsLowSurrogateExample1 {
    public static void main(String[] args) {
      // Create three char primitives ch1, ch2 and ch3.
      char ch1, ch2, ch3;
      // Assign the values to ch1, ch2 and ch3.
      ch1 = '\udc34';
      ch2 = 'a';
      ch3 = 'Y';
      // Create three boolean primitives b1, b2 and b3.
      boolean b1, b2, b3;
      b1 = Character.isLowSurrogate(ch1);
      b2 = Character.isLowSurrogate(ch2);
      b3 = Character.isLowSurrogate(ch3);

      String str1 = "The first character '"+ch1 + "' is a Unicode low-surrogate: " + b1;
      String str2 = "The second character '"+ch2 + "' is a Unicode low-surrogate: " + b2;
      String str3 = "The third character '"+ch3 + "' is a Unicode low-surrogate: " + b3;
      // Print the values of b1, b2 and b3.
      System.out.println( str1 );
      System.out.println( str2 );
      System.out.println( str3 );
   }
}

输出

The first character '?' is a Unicode low-surrogate: true
The second character 'a' is a Unicode low-surrogate: false
The third character 'Y' is a Unicode low-surrogate: false

示例 2

public class JavaCharacterIsLowSurrogateExample2 {
    public static void main(String[] args) {
      // Create four char primitives ch1, ch2, ch3 and ch4.
      char ch1, ch2, ch3, ch4;
      // Assign the values to ch1, ch2, ch3 and ch4.
      ch1 = '*';
      ch2 = 'a';
      ch3 = 'Y';
      ch4 = '#';
      // Create four boolean primitives b1, b2, b3 and b4.
      boolean b1, b2, b3, b4;
      b1 = Character.isLowSurrogate(ch1);
      b2 = Character.isLowSurrogate(ch2);
      b3 = Character.isLowSurrogate(ch3);
      b4 = Character.isLowSurrogate(ch4);

      String str1 = "The first character '"+ch1 + "'is a Unicode low-surrogate: " + b1;
      String str2 = "The second character '"+ch2 + "' is a Unicode low-surrogate: " + b2;
      String str3 = "The third character '"+ch3 + "' is a Unicode low-surrogate: " + b3;
      String str4 = "The fourth character '"+ch4+ "' is a Unicode low-surrogate: " + b4;   
      //Print the values of b1, b2, b3 and b4.
      System.out.println( str1 );
      System.out.println( str2 );
      System.out.println( str3 );
      System.out.println( str4 );
   }
}

输出

The first character '*'is a Unicode low-surrogate: false
The second character 'a' is a Unicode low-surrogate: false
The third character 'Y' is a Unicode low-surrogate: false
The fourth character '#' is a Unicode low-surrogate: false

示例 3

import java.util.Scanner;
public class JavaCharacterIsLowSurrogateExample3 {
   public static void main(String[] args) {
    // Ask the user for the first input. 
       System.out.print("Enter the first input:");
    // Use the Scanner class to get the user input.
       Scanner s1 = new Scanner(System.in);
    // Gets the user input.
       char[] value1 = s1.nextLine().toCharArray();
    // Check whether the user input is a low surrogate or not.
       for (char ch1 : value1) {
   boolean result1 = Character.isLowSurrogate(ch1);
    // print the result
       if(result1){
System.out.println("The character '" + ch1 + "' is a low-surrogate. ");				
                  }
     else{
System.out.println("The character '" + ch1 + "' is not a low-surrogate.");
           }		
       System.out.print("Enter the second input:");
       Scanner s2 = new Scanner(System.in);
       char[] value2 = s2.nextLine().toCharArray();
       for (char ch2 : value2) {
      boolean result2 = Character.isLowSurrogate(ch2);
      if(result2){
System.out.println("The character '" + ch2 + "' is a low-surrogate. ");				
                }
      else{
System.out.println("The character '" + ch2 + "' is not a low-surrogate.");
        }		
      System.out.print("Enter the third input:");
       Scanner s3 = new Scanner(System.in);
       char[] value3 = s3.nextLine().toCharArray();
       for (char ch3 : value3) {
      boolean result3 = Character.isLowSurrogate(ch3);
      if(result2){
System.out.println("The character '" + ch3 + "' is a low-surrogate. ");				
                }
      else{
System.out.println("The character '" + ch3 + "' is not a low-surrogate..");
           }		
         }
       }
     }
  }
}

输出

Enter the first input:H
The character 'H' is not a low-surrogate.
Enter the second input:)
The character ')' is not a low-surrogate.
Enter the third input:6
The character '6' is not a low-surrogate..

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Java Character isLowSurrogate() 方法

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Java Character isLowSurrogate() 方法

语法

参数

返回值

示例 1

示例 2

示例 3

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