Java Character isLowerCase() 方法

2024年11月6日 | 阅读时长 5 分钟

Character 类的 isLowerCase(char ch) 方法用于确定给定的（或指定的）字符是否是小写字符。

如果 Character.getTyper(char ch) 给出的一般类别是 LOWERCASE_LETTER，或者它具有某些辅助属性，则该字符被视为小写字符。

语法

参数

ch：需要测试的字符。

返回值

isLowerCase(char ch) 方法返回一个布尔值，即如果给定的（或指定的）字符是小写字符，则返回 true。否则，该方法返回 false。

示例 1

import java.util.Scanner;
public class JavaChracterisLowerCaseExample1{
  public static void main(String[] args) {
    // Ask the user for the first input.
	 System.out.print("Enter the first character:");	
   // Use the scanner class to get the user input.
	Scanner s1 = new Scanner(System.in);
   // Gets a single character.
	char value1 = s1.nextLine().toCharArray()[0];
   // Check whether the user input is in lower case or not.
	boolean check1 = Character.isLowerCase(value1);
   // Print the first result.
	if(check1){
	System.out.print("The first character \'"+value1+"\' is in lower case.\n");
		}
		else{
	System.out.print("The first character \'"+value1+"\' is not in lower case.\n");
            }	
         System.out.print("Enter the second character:");	
	Scanner s2 = new Scanner(System.in);
	char value2 = s2.nextLine().toCharArray()[0];
	boolean check2 = Character.isLowerCase(value2);
	if(check2){
	System.out.print("The second character \'"+value2+"\' is in lower case.\n");
		}
		else{
	System.out.print("The second character \'"+value2+"\' is not in lower case.\n");
            }	
        }
    }

输出

Enter the first character:H
The first character 'H' is not in lower case.
Enter the second character:h
The second character 'h' is in lower case.

示例 2

  public class JavaChracteisLowerCasetExample2{
  public static void main(String[] args) {
      // Create four char primitives ch1, ch2, ch3 and ch4.
       char ch1;
       char ch2;
       char ch3;
       char ch4;
      // Assign the values to ch1, ch2, ch3 and ch4.
       ch1 = 'A';
       ch2 = 'b';
       ch3 = 'M';
       ch4 = 'k';
      // Create four boolean primitives b1, b2, b3 and b4.
      boolean b1 = Character.isLowerCase(ch1);
      boolean b2 = Character.isLowerCase(ch2);
      boolean b3 = Character.isLowerCase(ch3);
      boolean b4 = Character.isLowerCase(ch4);
      String str1 = "The first character '"+ ch1+ "' is in lower case: " + b1;
      String str2 = "The second character '"+ch2+"' is in lower case: " + b2;
      String str3 = "The third character '"+ch3+ "' is in lower case: " + b3;
      String str4 = "The fourth character '"+ch4+ "' is in lower case: " + b4;
      // Print the values of b1, b2, b3 and b4.
      System.out.println( str1 );
      System.out.println( str2 );
      System.out.println( str3 );
      System.out.println( str4 );
   }
}

输出

The first character 'A' is in lower case: false
The second character 'b' is in lower case: true
The third character 'M' is in lower case: false
The fourth character 'k' is in lower case: true

示例 3

public class JavaChracterisLowerCaseExample3{
  public static void main(String[] args) {
     // Create three char primitives ch1, ch2 and ch3.
       char ch1, ch2, ch3;
     // Assign the values to ch1, ch2 and ch3.
      ch1 = 'A';
      ch2 = 'a';
      ch3 = '_';
     // Create three boolean primitives b1, b2 and b3.
      boolean b1, b2, b3;
     // Check whether the characters ch1, ch2 and ch3 are in lowercase or not and assign the results to b1, b2 and b3.
      b1 = Character.isLowerCase(ch1);
      b2 = Character.isLowerCase(ch2);
      b3 = Character.isLowerCase(ch3);
      String str1 = "The first character '"+ch1 +"' is in lowercase: " + b1;
      String str2 = "The second character '"+ch2 +"' is in lowercase: " + b2;
      String str3 = "The third character '"+ch3 +"' is in lowercase: " + b3;
      // Print the values of b1, b2 and b3.
      System.out.println( str1 );
      System.out.println( str2 );
      System.out.println( str3 );
   }
}

输出

The first character 'A' is in lowercase: false
The second character 'a' is in lowercase: true
The third character '_' is in lowercase: false

Java Character isLowerCase() 方法

Character 类的 isLowerCase(int codePoint) 方法用于确定给定的（或指定的）字符是否是小写字符。

如果 Character.getTyper(int codePoint) 给出的一般类别是 LOWERCASE_LETTER，或者它具有某些辅助属性，则该字符被视为小写字符。

语法

参数

codePoint：需要测试的字符的 codePoint。

返回值

isLowerCase(int codePoint) 方法返回一个布尔值，即如果给定的（或指定的）字符是小写字符，则返回 true。否则，该方法返回 false。

示例 1

public class JavaCharacterIsLowerCaseExample1 {
   public static void main(String[] args) {
    // Create four char primitives codePoint1, codePoint2, codePoint3 and codePoint4.
      int codePoint1;
      int codePoint2;
      int codePoint3;
      int codePoint4;
      // Assign the values to codePoint1, codePoint2, codePoint3 and codePoint4.
      codePoint1 = 77;
      codePoint2 = 116;
      codePoint3= 198;
      codePoint4 = 102;
      // Create four boolean primitives b1, b2, b3 and b4.
      boolean b1, b2, b3,b4;
      // Check whether the codePoint1, codePoint2, codePoint3 and codePoint4  are letters or digits or not and assign the results to b1, b2, b3 and b4.
      b1 = Character.isLowerCase(codePoint1);
      b2 = Character.isLowerCase(codePoint2);
      b3 = Character.isLowerCase(codePoint3);
      b4 = Character.isLowerCase(codePoint4);

      String str1 = "The first codePoint  '"+codePoint1 + "' is in lowercase: " + b1;
      String str2 = "The second codePoint '"+codePoint2 + "' is in lowercase: " + b2;
      String str3 = "The third codePoint  '"+codePoint3 + "' is in lowercase: " + b3;
      String str4 = "The fourth codePoint '"+codePoint4 + "' is in lowercase: " + b4;
      // Print the values of str1, str2, str3 and str4.
      System.out.println(str1);
      System.out.println(str2);
      System.out.println(str3);
      System.out.println(str4);
   }
}

输出

The first codePoint  '77' is in lowercase: false
The second codePoint '116' is in lowercase: true
The third codePoint  '198' is in lowercase: false
The fourth codePoint '102' is in lowercase: true

示例 2

public class JavaCharacterIsLowerCaseExample2 {
  public static void main(String[] args) {
      // Create two int primitives cp1 and cp2.
      int cp1, cp2;
      // Assign the values to cp1 and cp2.
      cp1 = 0x0045;
      cp2 = 0x0f89;
      // Create two boolean primitives b1 and b2.
      boolean b1, b2;
      b1 = Character.isLowerCase(cp1);
      b2 = Character.isLowerCase(cp2);
      String str1 = "The first character represents as a lowercase character: " + b1;
      String str2 = "The second character represents as a lowercase character: " + b2;
      // Print the values of b1 and b2.
      System.out.println( str1 );
      System.out.println( str2 );
     }
  }

输出

The first character represents as a lowercase character: false
The second character represents as a lowercase character: false

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Java Character isLowerCase() 方法

语法

参数

返回值

示例 1

示例 2

示例 3

Java Character isLowerCase() 方法

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返回值

示例 1

示例 2

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Java Character isLowerCase() 方法

语法

参数

返回值

示例 1

示例 2

示例 3

Java Character isLowerCase() 方法

语法

参数

返回值

示例 1

示例 2

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