Java Character toUpperCase() 方法

2024年11月6日 | 阅读 4 分钟

Character 类的 toUpperCase(char ch) 方法使用 Unicode 数据文件提供的大小写映射信息，将给定的字符参数转换为大写。

请注意，对于某些字符，Character.isUpperase(Character.UpperCase(ch)) 可能不总是返回 true。

实际上，可以使用 String.toUpperCase() 将字符映射为大写。与 Character 大小写映射相比，String 大小写映射有各种好处。String 大小写映射可用于执行本地敏感映射、上下文敏感映射，而 Character 大小写映射则不能。

语法

参数

ch：需要转换的字符。

返回值

toUpperCase(char ch) 方法返回给定字符的大写形式。否则，此方法返回字符本身。

示例 1

public class JavaCharacterToUpperCaseExample1 {
    public static void main(String[] args) {
      // Create four char primitives.
        char ch1, ch2, ch3, ch4;
      // Assign the values to ch1 and ch2.
      ch1 = 'm';
      ch2 = 'q';
      // Assign the uppercase of ch1 and ch2 to ch3 and ch4 respectively.
      ch3 = Character.toUpperCase(ch1);
      ch4 = Character.toUpperCase(ch2);
      String str1 = "The uppercase of the character '" + ch1 + "' is given as: " + ch3;
      String str2 = "The uppercase of the character '" + ch2 + "' is given as: " + ch4;
      // Print the values of ch1 and ch2.
      System.out.println( str1 );
      System.out.println( str2 );
   }
}

输出

The titlecase of character 'm' is given as: M
The titlecase of character 'q' is given as: Q

示例 2

public class JavaCharacterToUpperCaseExample2{
    public static void main(String[] args) {
      // Create four char primitives.
        char ch1, ch2, ch3, ch4;
      // Assign the values to ch1 and ch2.
      ch1 = '+';
      ch2 = 'f';
      // Assign the uppercase of ch1 and ch2 to ch3 and ch4 respectively.
      ch3 = Character.toUpperCase(ch1);
      ch4 = Character.toUpperCase(ch2);
      String str1 = "The uppercase of the character '" + ch1 + "' is given as: " + ch3;
      String str2 = "The uppercase of the character '" + ch2 + "' is given as: " + ch4;
      // Print the values of ch1 and ch2..
      System.out.println( str1 );
      System.out.println( str2 );
   }
}

输出

The uppercase of the character '+' is given as: +
The uppercase of the character 'F' is given as: F

Java Character toUpperCase(int codePoint) 方法

Character 类的 toUpperCase(int codePoint) 方法使用 Unicode 数据文件提供的大小写映射信息，将给定的字符（Unicode 代码点）参数转换为大写。

请注意，对于某些字符，Character.isUpperase(Character.UpperCase(codePoint)) 可能不总是返回 true。

语法

参数

codePoint：需要测试的字符的 codePoint。

返回值

toUpperCase(int codePoint) 方法返回给定字符（Unicode 代码点）的大写形式。否则，此方法返回字符本身。

示例 1

public class JavaCharactertoUpperCaseExample_1 {
    public static void main(String[] args) {
	// Initialize two char primitives.
           int codepoint1 = 102;
           int codepoint2 = 110;
        // Convert the codepoints to char type.
	    char ch1 = (char) codepoint1;
           char ch2 = (char) codepoint2;
	// Convert the codepoints to uppercase.
	   char upper1 = Character.toUpperCase(ch1);
          char upper2 = Character.toUpperCase(ch2);
	// Print the result.
System.out.println("The uppercase for the character '" + ch1 + "' is given as: " + upper1);
System.out.println("The uppercase for the character '" + ch2 + "' is given as: " + upper2);
	}
}

输出

The uppercase for the character 'f' is given as: F
The uppercase for the character 'n' is given as: N

示例 2

public class JavaCharactertoUpperCaseExample_2 {
    public static void main(String[] args) {
         // Initialize two char primitives.
           int codepoint1 = 119;
           int codepoint2 = 80;
        // Convert the codepoints to char type.
	   char ch1 = (char) codepoint1;
           char ch2 = (char) codepoint2;
	// Convert the codepoints to uppercase.
	   char upper1 = Character.toUpperCase(ch1);
           char upper2 = Character.toUpperCase(ch2);
	// Print the result.
String str1 = "The uppercase for the character '" + ch1 + "' is given as: " + upper1;
String str2 = "The uppercase for the character '" + ch2 + "' is given as: " + upper2;
	 System.out.println(str1);
               System.out.println(str2);
    }
}

输出

The uppercase for the character 'w' is given as: W
The uppercase for the character 'P' is given as: P

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Java Character toUpperCase() 方法

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示例 1

示例 2

Java Character toUpperCase(int codePoint) 方法

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返回值

示例 1

示例 2

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Java Character toUpperCase() 方法

语法

参数

返回值

示例 1

示例 2

Java Character toUpperCase(int codePoint) 方法

语法

参数

返回值

示例 1

示例 2

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