Java Character isValidCodePoint()用法及代码示例

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

用法

public static boolean isValidCodePoint(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

isValidCodePoint(int codePoint) 方法返回一个布尔值，即如果给定(或指定)字符位于 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。

例子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

例子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

例子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

相关用法

注：本文由纯净天空筛选整理自 Java Character isValidCodePoint() 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。