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Java Character isIdentifierIgnorable()用法及代码示例


Character 类的 isIdentifierIgnorable(int codePoint) 方法一般决定指定的字符是否可以被视为 Java 中的可忽略字符或 Unicode 标识符。

以下字符在 Java 或 Unicode 标识符中被视为可忽略字符：

  • 没有空格的 ISO 控制字符。
  • 所有具有 FORMAT 通用类别值的字符。

用法

public static boolean isIdentifierIgnorable(int codePoint)

参数

上述方法只需要一个参数：

a.)codePoint 是需要测试的字符。

返回值

isIdentifierIgnorable(int codePoint) 方法返回一个布尔值，即如果给定(或指定)字符是一个可忽略的控制字符，它可能是 Java 或 Unicode 标识符的一部分，则返回 true。否则，此方法返回 false。

例子1

public class JavaCharacterisIdentifierIgnorableintcodePointExample1 {
	public static void main(String[] args) {
	// Create three int primitives codePoint1, codePoint2 and codePoint3.
	int codePoint1, codePoint2, codePoint3;	
	// Assign the values to codePoint1, codePoint2 and codePoint3;
	codePoint1 = 0x008f;
	codePoint2 = 0x0abc;
	codePoint3 = 0x0a76;
// Create three boolean primitives b1, b2 and b3;
	boolean b1, b2, b3;
	// Assign the results of isIdentifierIgnorable of codePoint1, codePoint2 and codePoint3 to b1, b2and b3 respectively.
	b1 = Character.isIdentifierIgnorable(codePoint1);
	b2 = Character.isIdentifierIgnorable(codePoint2);
	b3 = Character.isIdentifierIgnorable(codePoint3);
System.out.println("The first codePoint is an ignorable control character is: "+ b1);
System.out.println("The second codePoint is an ignorable control character is:"+ b2);
System.out.println("The third codePoint is an ignorable control character is: "+ b3);
	   }
	}

输出：

The first codePoint is an ignorable control character is: true
The second codePoint is an ignorable control character is:false
The third codePoint is an ignorable control character is: false

例子2

public class JavaCharacterisIdentifierIgnorableintcodePointExample2 {
public static void main(String[] args) {
	// Create the integer primitives c1 and c2 and assign the values to them.
	int c1 = 0x119f;
	int c2 = 0x0abc;
	// Create two boolean primitives b1 and b2.
	boolean b1 = Character.isIdentifierIgnorable(c1);
	boolean b2 = Character.isIdentifierIgnorable(c2); 
	// Print the values of b1 and b2.
System.out.println( "The first codePoint is an ignorable control character: "  + b1);
System.out.println( "The second codePoint  is an ignorable control character:" + b2);
	   }
	}

输出：

The first codePoint is an ignorable control character: false
The second codePoint  is an ignorable control character:false

Java 字符 isIdentifierIgnorable() 方法

Character 类的 isIdentifierIgnorable(char ch) 方法一般判断指定的字符是否可以视为 Java 中的可忽略字符或 Unicode 标识符。

以下字符在 Java 或 Unicode 标识符中被视为可忽略字符：

  • 没有空格的 ISO 控制字符。
  • 所有具有 FORMAT 通用类别值的字符。

注意：上述方法不能用于处理增补字符。为了支持所有 Unicode 字符，包括增补字符，我们可以使用 isIdentifierIgnorable(int codePoint) 方法。

用法

public static boolean isIdentifierIgnorable(char ch)

参数

上述方法只需要一个参数：

a.)需要测试的字符。

返回值

isIdentifierIgnorable(char ch) 方法返回一个布尔值，即如果给定(或指定)字符是可忽略的控制字符，并且也是 Java 或 Unicode 标识符的一部分，则返回 true。否则，此方法返回 false。

例子3

public class JavaCharacterisIdentifierIgnorableExample3 {
public static void main(String[] args) {
	// Create three char primitives char1, char2 and char3.
	char char1, char2, char3;
	// Assign the values to char1, char2 and char3.
	char1 = 'A';
	char2 = 'B';
	char3 = 'C';
	// Create three boolean primitives b1, b2 and b3.
	boolean b1, b2, b3;
// Assign isIdentifierIgnorable results of char1, ch2 and ch3 to b1, b2 and b3 respectively.
	b1 = Character.isIdentifierIgnorable(char1);
	b2 = Character.isIdentifierIgnorable(char2);
	b3 = Character.isIdentifierIgnorable(char3);
String str1 = "The first character  'A' is an ignorable control character: " + b1;
String str2 = "The second character 'B' is an ignorable control character:" + b2;
String str3 = "The third character 'C' is an ignorable control character:" + 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  'A' is an ignorable control character: false
The second character 'B' is an ignorable control character:false
The third character  'C' is an ignorable control character: false

示例 4

public class JavaCharacterisIdentifierIgnorableExample4 {
public static void main(String[] args) {
	// Create three char primitives char1, char2 and char3.
	char char1, char2, char3;
	// Assign the values to char1, char2 and char3.
	char1 = '1';
	char2 = '2';
	char3 = '3';
	// Create three boolean primitives b1, b2 and b3.
	boolean b1, b2, b3;
	// Assign isIdentifierIgnorable results of char1, ch2 and ch3 to b1, b2 and b3 respectively.
	b1 = Character.isIdentifierIgnorable(char1);
	b2 = Character.isIdentifierIgnorable(char2);
	b3 = Character.isIdentifierIgnorable(char3);
String str1 = "The first character  '1' is an ignorable control character: " + b1;
String str2 = "The second character '2' is an ignorable control character: " + b2;
String str3 = "The third character  '3' is an ignorable control character: " + 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  '1' is an ignorable control character: false
The second character '2' is an ignorable control character: false
The third character  '3' is an ignorable control character: false

例 5

import java.util.Scanner;
public class JavaCharacterisIdentifierIgnorableExample5 {
	public static void main(String[] args) {
	// Ask the user for the first input.
		System.out.print("Enter the first input of your choice:");
	// Use Scanner to get the input.
		Scanner obj1 = new Scanner(System.in);
		char[] value1 = obj1.nextLine().toCharArray();
// Get a value which indicates whether the given character is ignorable or not.
		for (char ch1:value1) {
		boolean result1 = Character.isIdentifierIgnorable(ch1);		
System.out.println("The character '"+ ch1 +"' is an ignorable character:" + result1);			
	     }
	// Ask the user for the second input.
		System.out.print("Enter the second input of your choice:");
		Scanner obj2 = new Scanner(System.in);
		char[] value2 = obj1.nextLine().toCharArray();
		for (char ch2:value2) {
		boolean result2 = Character.isIdentifierIgnorable(ch2); System.out.println("The character '"+ ch2 +"' is an ignorable character:" + result2);			
	  }
     }
  }

输出：

Enter the first input of your choice:G
The character 'G' is an ignorable character:false
Enter the second input of your choice:#
The character '#' is an ignorable character:false





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注：本文由纯净天空筛选整理自 Java Character isIdentifierIgnorable() Method。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。