Java Character isValidCodePoint() 方法

6 Nov 2024 | 3 分钟阅读

Character 类的 isValidCodePoint(int codePoint) 方法用于确定给定的（或指定的）字符是否是有效的 Unicode 代码点。

语法

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

isValidCodePoint(int codePoint) 方法返回一个布尔值，即，如果给定的（或指定的）字符在 MIN_CODE_POINT 和 MAX_CODE_POINT 之间的范围内，则返回 true。否则，此方法返回 false。

示例 1

public class JavaCharacterisValidCodePointExample1 {
    public static void main(String[] args) {
         // Initialize the codepoints: cp1, cp2, cp3 and cp4
		int cp1 = 12;
		int cp2 = 51;
                                int cp3 = 121;
                                int cp4 = 160;
         // Check whether the codepoints are valid or not.
		boolean result1 = Character.isValidCodePoint(cp1);
		boolean result2 = Character.isValidCodePoint(cp2);
                                boolean result3 = Character.isValidCodePoint(cp3);
                                 boolean result4 = Character.isValidCodePoint(cp4);
	// Print the results.
	System.out.println("The codePoint '"+ cp1 + "' is a valid codepoint : "+result1);
	System.out.println("The codePoint '"+ cp2 + "' is a valid codepoint : "+result2);
                System.out.println("The codePoint '"+ cp3 + "' is a valid codepoint : "+result3);
               System.out.println("The codePoint '"+ cp4 + "' is a valid codepoint : "+result4);
    }
}

输出

The codePoint '12' is a valid codepoint : true
The codePoint '51' is a valid codepoint : true
The codePoint '121' is a valid codepoint : true
The codePoint '160' is a valid codepoint : true

示例 2

public class JavaCharacterisValidCodePointExample2 {
     public static void main(String[] args) {
      //Create four int primitives cp1, cp2, cp3 and cp4.
        int cp1, cp2, cp3, cp4;
        // Assign the values to ch1, ch2, ch3 and ch4.
        cp1 = 121;
        cp2 = 128;
        cp3 = 227;
        cp4 = 342;
        // Create four boolean primitives b1, b2, b3 and b4.
        boolean b1, b2, b3, b4;
        b1 = Character.isValidCodePoint(cp1);
        b2 = Character.isValidCodePoint(cp2);  
        b3 = Character.isValidCodePoint(cp3);  
        b4 = Character.isValidCodePoint(cp4);  
        // Print the values.
        String str1 = "The first codePoint '"+cp1+"' is a valid codePoint :"+ b1;
        String str2 = "The second codePoint '"+cp2+"' is a valid codePoint :"+ b2;
        String str3 = "The third codePoint '"+cp3+"' is a valid codePoint  :"+ b3;
        String str4 = "The fourth codePoint '"+cp4+"' is a valid codePoint :"+ b4;
        System.out.println(str1);
        System.out.println(str2);
        System.out.println(str3);
        System.out.println(str4);
    }
} 

输出

The first codePoint '121' is a valid codePoint :true
The second codePoint '128' is a valid codePoint :true
The third codePoint '227' is a valid codePoint  :true
The fourth codePoint '342' is a valid codePoint :true

示例 3

public class JavaCharacterisValidCodePointExample3 {
    public static void main(String[] args) {
        //Create four int primitives cp1, cp2, cp3 and cp4.
           int cp1, cp2, cp3, cp4;
        // Assign the values to ch1, ch2, ch3 and ch4.
        cp1 = 323;
        cp2 = 345;
        cp3 = 564;
        cp4 = 787;
        // Create four boolean primitives b1, b2, b3 and b4.
        boolean b1, b2, b3, b4;
        b1 = Character.isValidCodePoint(cp1);
        b2 = Character.isValidCodePoint(cp2);  
        b3 = Character.isValidCodePoint(cp3);  
        b4 = Character.isValidCodePoint(cp4);  
        // Print the values.
    System.out.println("The first codePoint '"+cp1+"' is a valid codePoint :"+ b1);
    System.out.println("The second codePoint '"+cp2+"' is a valid codePoint :"+ b2);
    System.out.println("The third codePoint '"+cp3+"' is a valid codePoint :"+ b3);
    System.out.println("The fourth codePoint '"+cp4+"' is a valid codePoint :"+ b4);
    }
} 

输出

The first codePoint '323' is a valid codePoint :true
The second codePoint '345' is a valid codePoint :true
The third codePoint '564' is a valid codePoint :true
The fourth codePoint '787' is a valid codePoint :true

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Java Character isValidCodePoint() 方法

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示例 2

示例 3

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Java Character isValidCodePoint() 方法

语法

参数

返回值

示例 1

示例 2

示例 3

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