Java Character isISOControl()方法及实例

java.lang.Character.isISOControl() 是java中的一个内置方法，用于确定指定的字符是否是ISO控制字符。如果一个字符的代码在’\u0000’到’\u001F’的范围内或在’\u007F’到’\u009F’的范围内，则被认为是一个ISO控制字符。这种方法不能处理补充字符。为了支持所有的Unicode字符，包括补充字符，上述方法中的参数可以是int数据类型。

语法

public static boolean isISOControl(data_type ch)

参数： 该函数接受一个参数 ch ，这是必须的。它指定了要测试的字符。该参数可以是char或int数据类型。

返回值： 该函数返回一个布尔值。如果该字符是ISO控制字符，该布尔值为真，否则为假。

下面的程序说明了上述方法。

程序1 :

// java program to demonstrate
// Character.isISOControl() method
// when the parameter is a character
  
import java.lang.*;
  
public class gfg {
  
    public static void main(String[] args)
    {
  
        // create 2 char primitives c1, c2 and assign values
        char c1 = '-', c2 = '\u0017';
  
        // assign isISOControl results of c1
        // to boolean primitives  bool1
        boolean bool1 = Character.isISOControl(c1);
  
        if (bool1)
            System.out.println(c1 + " is an ISO control character");
        else
            System.out.println(c1 + " is not an ISO control character");
  
        // assign isISOControl results of c2
        // to boolean primitives  bool2
        boolean bool2 = Character.isISOControl(c2);
  
        if (bool2)
            System.out.println(c2 + " is an ISO control character");
        else
            System.out.println(c2 + " is not an ISO control character");
    }
}

输出:

- is not an ISO control character
 is an ISO control character

程序2

// java program to demonstrate
// Character.isISOControl(char ch) method
// when the parameter is an integer
import java.lang.*;
  
public class gfg {
  
    public static void main(String[] args)
    {
  
        // create 2 char primitives c1, c2 and assign values
        int c1 = 0x008f;
        int c2 = 0x0123;
  
        // assign isISOControl results of c1
        // to boolean primitives  bool1
        boolean bool1 = Character.isISOControl(c1);
        if (bool1)
            System.out.println(c1 + " is an ISO control character");
        else
            System.out.println(c1 + " is not an ISO control character");
  
        // assign isISOControl results of c2
        // to boolean primitives  bool2
        boolean bool2 = Character.isISOControl(c2);
        if (bool2)
            System.out.println(c2 + " is an ISO control character");
        else
            System.out.println(c2 + " is not an ISO control character");
    }
}

输出:

143 is an ISO control character
291 is not an ISO control character

参考资料 : https://docs.oracle.com/javase/7/docs/api/java/lang/Character.html#isISOControl(char)