Java Character codePointCount() 方法

2024年11月6日 | 阅读 4 分钟

此方法有 2 种语法。

Java Character codePointCount(char[]a, int offset, int count) 方法

codePointCount(char[]a, int offset, int count) 方法用于返回 char 数组子数组中的 Unicode 代码点的数量。offset 参数是给定 char 数组中第一个 char 的索引，count 参数指示子数组的长度。

语法

参数

上述方法需要三个参数

char 数组。
offset 是给定 char 数组中第一个 char 的索引。
count 是给定 char 中子数组的长度。

返回值

此方法返回指定子数组中的 Unicode 代码点的数量。

示例 1

public class CharactercodePointCountMethodExample1 {
	public static void main(String[] args) {
		System.out.println("Welcome to our tutorial site:");
		CharSequence seq = "Hello";  
		// Declare offset.
		int offset = 2;
		// Declare count.
		int countValue = 4;		
		int result = Character.codePointCount(seq, offset, countValue);
	     // Print the result.
		System.out.println("The result is given as: " + result);
	
       }
}

输出

Welcome to our tutorial site:
The result is given as: 2

示例 2

public class CharactercodePointCountMethodExample2 {
    public static void main(String[] args) {
      System.out.println("The alphabets are: 'a', 'b', 'c', 'd', 'e'");
	 char[] c1 = new char[] { 'a', 'b', 'c', 'd', 'e' };
	 int offset1  = 0, count1 = 4;
	 int res1 = Character.codePointCount(c1, offset1, count1);
System.out.println("The number of Unicode code point for alphabets are " + res1);
System.out.println("The numbers are:  '1', '2', '3', '4', '5'");
	 char[] c2 = new char[] { '1', '2', '3', '4', '5' };
	 int offset2  = 1, count2 = 3;
	 int res2 = Character.codePointCount(c2, offset2, count2);
System.out.println("The number of Unicode code point for numbers are " + res2);
	   }
	}

输出

The alphabets are: 'a', 'b', 'c', 'd', 'e'
The number of Unicode code point for alphabets are 4
The numbers are:  '1', '2', '3', '4', '5'
The number of Unicode code point for numbers are 3

示例 3

public class CharactercodePointCountMethodExample3{
   public static void main(String args[])
    {
     String str1 = "Hello everyone"; 
     System.out.println("Hello everyone");
     int Total1 = str1.codePointCount(3, 9);
     System.out.println(Total1 + " is generated because method counts the first argument.");
     String str2 = "Everday is a fun day";
     System.out.println("Everyday is a fun day");
     int Total2 = str2.codePointCount(6, 8);
     System.out.println(Total2 + " is generated because method counts the second argument.");
     }
  }

输出

Hello everyone
6 is generated because method counts the first argument.
Everyday is a fun day
2 is generated because method counts the second argument.

Java Character codePointCount() 方法

Character 类的 codePointCount(CharSequence seq, int beginIndex, int endIndex) 方法用于返回特定 char 序列的文本范围内的 Unicode 代码点的数量。文本范围从 beginIndex 开始，到 endIndex 结束。

语法

Public static int codePointCount(CharSequence seq, int beginIndex, int endIndex) 

参数

上述方法需要三个参数

char 序列。
beginIndex 是文本范围第一个 char 的索引。
endIndex 是文本范围最后一个 char 之后的索引。

返回值

codePointCount(CharSequence seq, int beginIndex, int endIndex) 方法返回指定文本范围内的 Unicode 代码点的数量。

示例 4

public class CharactercodePointCountMethodExample4 {
	public static void main(String[] args) {
       // Initialize a new CharSequence object
		CharSequence cs = "This is a unique example!";
	    System.out.println("This is a unique example!");
	// Initialize beginIndex and endIndex
		int beginIndex = 0;
		int endIndex = cs.length();	
		int result = Character.codePointCount(cs, beginIndex,endIndex);
	   System.out.println("The result comes to be:"+result);
	}
} 

输出

This is a unique example!
The result comes to be:25

示例 5

public class CharactercodePointCountMethodExample5 {
     public static void main(String[] args) { // Initialize a new CharSequence object
	CharSequence cs1 = "This is a unique example!"; System.out.println("This is a unique example!"); 
	// Initialize beginIndex and endIndex
	int beginIndex1 = 0;
	int endIndex1 = cs1.length();	
	int result1 = Character.codePointCount(cs1, beginIndex1,endIndex1);
	System.out.println("The result comes to be:"+result1);
	CharSequence cs2 = "Hello World!";
	System.out.println(cs2);
       int beginIndex2 = 4, endIndex2 = 8;
       int result2 = Character.codePointCount(cs2, beginIndex2, endIndex2);
       String str = "Number of Unicode code points is " + result2;
      System.out.println( str );
        }
}

输出

This is a unique example!
The result comes to be:25
Hello World!
Number of Unicode code points is 4

示例 6

public class CharactercodePointCountMethodExample6 {
	public static void main(String[] args) {

		// Initialize a new CharSequence object
		CharSequence cs1 = "This is a unique example!";
		System.out.println(cs1);
		// Initialize beginIndex and endIndex
		int beginIndex1 = 0;
		int endIndex1 = cs1.length();	
		int result1 = Character.codePointCount(cs1, beginIndex1,endIndex1);
		System.out.println("The result comes to be: "+result1);
	    CharSequence cs2 = "Java is a high level language!";
		System.out.println(cs2);
		int beginIndex2 = 0;
		int endIndex2 = cs2.length();	
		int result2 = Character.codePointCount(cs2, beginIndex2,endIndex2);
		System.out.println("The result comes to be: "+result2);
		CharSequence cs3 = "Java is based on the cocepts of OOPS!";
		System.out.println(cs3);
		int beginIndex3 = 0;
		int endIndex3 = cs3.length();	
		int result3 = Character.codePointCount(cs3, beginIndex3,endIndex3);
		System.out.println("The result comes to be: "+result3);
	
	}
		
	}

输出

This is a unique example!
The result comes to be: 25
Java is a high level language!
The result comes to be: 30
Java is based on the cocepts of OOPS!
The result comes to be: 37

下一主题Java-character-compare-method

Java Character codePointCount() 方法

Java Character codePointCount(char[]a, int offset, int count) 方法

语法

参数

返回值

示例 1

示例 2

示例 3

Java Character codePointCount() 方法

语法

参数

返回值

示例 4

示例 5

示例 6

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Java Character codePointCount() 方法

Java Character codePointCount(char[]a, int offset, int count) 方法

语法

参数

返回值

示例 1

示例 2

示例 3

Java Character codePointCount() 方法

语法

参数

返回值

示例 4

示例 5

示例 6

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