Java Character getNumericValue() 方法

2024年12月12日 | 阅读 2 分钟

character 类的 getNumericValue() 方法返回指定字符的 int 值。如果该字符没有 int 值，则返回 -1。如果该字符具有无法表示为非负整数的数值，则返回 -2。

语法

参数

上述方法只需要一个参数

codePoint 是要转换的字符（Unicode 码点）。

返回值

getNumericValue(int codePoint) 方法返回字符的数值，作为一个非负 int 值。如果该字符具有数值但该数值无法表示为非负 int 值，则此方法返回 -2。如果该字符没有数值，则此方法返回 -1。

示例 1

public class JavaCharactergetNumericValueExample1 {
	public static void main(String[] args) {
		// Initialize a codepoint
		int codepoint = 110;
		// Convert codepoint to char
		char ch = (char) codepoint;
		// Convert the code point to its numeric value
		int digit = Character.getNumericValue(codepoint);
		// Print the result
System.err.println("The character '" + ch + "' has a numeric value represented as: " + digit);
	}
}

输出

The character 'n' has a numeric value represented as: 23

示例 2

public class JavaCharactergetNumericValueExample2 {
   public static void main(String[] args) {
	 int obj1 = 88, obj2 = 0x0f600;
	 int a1 = Character.getNumericValue(obj1);
	 int b2 = Character.getNumericValue(obj2);
	 String str1 = "Numeric value for code point obj1 is " + a1;
	 String str2 = "Numeric value for code point obj2 is " + b2;
   // Print a1 and i2 
	 System.out.println( str1 );
	 System.out.println( str2 );
	   }
	}

输出

Numeric value for code point obj1 is 33
Numeric value for code point obj2 is -1

示例 3

public class JavaCharactergetNumericExample3 {
	   public static void main(String[] args) {
		// Initialize a codepoint
			int codepoint1 = 110;
		    int codepoint2 = 00;			
		    int codepoint3 = 54;
	   // Convert codepoint to char
		    char ch1 = (char) codepoint1;
			char ch2 = (char) codepoint2;
		    char ch3 = (char) codepoint3;
	   // Convert the code point to its numeric value
			int digit1 = Character.getNumericValue(codepoint1);
			int digit2 = Character.getNumericValue(codepoint2);
		    int digit3 = Character.getNumericValue(codepoint3);
	  // Print the result
	System.err.println("The character '" + ch1 + "' has a numeric value represented as: " + digit1);
	System.err.println("The character '" + ch2 + "' has a numeric value represented as: " + digit2);
	System.err.println("The character '" + ch3 + "' has a numeric value represented as: " + digit3);
				}
			}

输出

The character 'n' has a numeric value represented as: 23
The character ' ' has a numeric value represented as: -1
The character '6' has a numeric value represented as: 6

下一主题Java-character-gettype-method

Java Character getNumericValue() 方法

语法

参数

返回值

示例 1

示例 2

示例 3

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Java Character getNumericValue() 方法

语法

参数

返回值

示例 1

示例 2

示例 3

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