Java Character lowSurrogate() 方法

2024 年 11 月 6 日 | 阅读 2 分钟

Character 类的 lowSurrogate(int codePoint) 方法返回用于在 UTF-16 编码中表示字符的尾部代理码单元。另一方面，如果指定的字符不是补充字符，则返回一个未指定的 char。

如果 isSupplementaryCodePoint(x) 方法为 true，则 isLowSurrogate(lowSurrogate(x)) 和 toCodePoint(highSurrogate(x), lowSurrogate(x))==x 方法也为 true。

语法

参数

上述方法只需要一个参数

a.) codePoint，即需要测试的字符。

返回值

lowSurrogate(int codePoint) 方法返回用作 UTF-16 编码中字符表示的尾部码单元。

示例 1

public class JavaCharacterlowSurrogateExample1 {
	public static void main(String[] args) {
	    // Initialize three codepoints: cp1, cp2 and cp3.
		int cp1 = 65;
		int cp2 = 152;
             int cp3 = 567;
	    // Find the current surrogate codePoint.
		char result1 = Character.lowSurrogate(cp1);
		char result2 = Character.lowSurrogate(cp2);
             char result3 = Character.lowSurrogate(cp3);
	    // Print the result.
System.out.println("The current surrogate code unit for the character"+ cp1 +" is:"+ result1);
System.out.println("The current surrogate code unit for the character"+ cp2 +" is:"+ result2);
System.out.println("The current surrogate code unit for the character"+ cp3 +" is:"+ result3);
        }
}

输出

The current surrogate code unit for the character65 is:?
The current surrogate code unit for the character152 is:?
The current surrogate code unit for the character567 is:?

示例 2

public class JavaCharacterlowSurrogateExample2 {
public static void main(String[] args) {
        // Initialize three codepoints: cp1, cp2 and cp3
	 int cp1 = 49;
                int cp2 = 121;
                int cp3 = 2342;
     // Check whether the codepoints are current surrogate code units or not.
	        char check1 = Character.lowSurrogate(cp1);
                      char check2 = Character.lowSurrogate(cp2);
                      char check3 = Character.lowSurrogate(cp3);
        // Print the result.
	if(check1==3F){
	   System.out.print("The codepoint \'"+cp1+"\' is not a current surrogate code unit.\n");
		}
	else{
  	   System.out.print("The codePoint \'"+cp1+"\' is a current surrogate code unit.\n");
		}
                
	  if(check2==3F){
	      System.out.print("The codepoint \'"+cp2+"\' is not a current surrogate code unit.\n");
		}
	  else{
	     System.out.print("The codePoint \'"+cp2+"\' is a current surrogate code unit.\n");
		}
                
               if(check3==3F){
	     System.out.print("The codepoint \'"+cp3+"\' is not a  current surrogate code unit.\n");
		}
	 else{
	     System.out.print("The codePoint \'"+cp3+"\' is a current surrogate code unit.\n");
         	        }
         }
}

输出

The codePoint '49' is a current surrogate code unit.
The codePoint '121' is a current surrogate code unit.
The codePoint '2342' is a current surrogate code unit.

下一个主题Java-character-offsetbycodepoints-method

Java Character lowSurrogate() 方法

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Java Character lowSurrogate() 方法

语法

参数

返回值

示例 1

示例 2

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