Detailed explanation of examples of Character class

How to use the Character class

Character: Character type

1, attributes.
static int MIN_RADIX: Returns the minimum radix.
static int MAX_RADIX: Returns the maximum radix.
static char MAX_VALUE: The maximum value of character type.
static char MIN_VALUE: Minimum value of character type.
static Class TYPE: Returns the current type.

2、Constructor.
Character(char value): Construct a Character object with char parameters.

3. Method.
Instructions:
1. All methods are public;
2. Writing format: [Modifier]
Such as :
static int parseInt(String s) means: This method (parseInt) is a class method (static), the return type is (int), and the parameters required by the method are of type String.

1. char charValue(): Returns the value of the character object.
2. int compareTo(Character anotherCharacter): Compare the current Character object with anotherCharacter. The equality relationship returns 0; the less than relationship returns a negative number; the greater than relationship returns a positive number.
3. int compareTo(Object o): Compare the current object with another object. If o is a Character object, it has the same function as 2; otherwise, a ClassCastException is thrown.
4. static int digit(char ch, int radix): Returns the decimal value of the current character according to the base. If Character.MIN_RADIX Code:

System.out.
print
ln("Character.MIN_RADIX: " + Character.MIN_RADIX ); 
System.out.println("Character.MAX_RADIX: " + Character.MAX_RADIX ); 
System.out.println("Character.digit('2',2): " + Character.digit('2',2) ); 
System.out.println("Character.digit('7',10): " + Character.digit('7',10) ); 
System.out.println("Character.digit('F',16): " + Character.digit('F',16) );

The result is:

Character.MIN_RADIX: 2 
Character.MAX_RADIX: 36 
Character.digit('2',2): -1   不是有效值。
Character.digit('7',10): 7 
Character.digit('F',16): 15

5. boolean equals(Object obj): Compare with objobject. Returns "true" if and only if obj is not "null" and is consistent with the current Character
object.
6. static char forDigit(int digit, int radix): Determine the character represented by the current value based on a specific base. The inverse operation of 4, returns "'\u0000'" if the value is illegal.
Code:

System.out.println("Character.MIN_RADIX: " + Character.MIN_RADIX ); 
System.out.println("Character.MAX_RADIX: " + Character.MAX_RADIX ); 
System.out.println("Character.
for
Digit(2,2): " + Character.forDigit(2,2) ); 
System.out.println("Character.forDigit(7,10): " + Character.forDigit(7,10) ); 
System.out.println("Character.forDigit(15,16): " + Character.forDigit(15,16) );

The result is:

Character.MIN_RADIX: 2 
Character.MAX_RADIX: 36 
Character.forDigit(2,2): 
Character.forDigit(7,10): 7 
Character.forDigit(15,16): f

7. static int getNumericValue(char ch): Returns the numerical value of character ch.
8. static int getType(char ch): Returns the type of character. Please check the Java documentation for specific types.
9. int hashCode(): Returns the hash table code of the current character.
10. static boolean isDefined(char ch): Determine whether the character ch is clearly defined in the Unicode character set.
11. static boolean isDigit(char ch): Determine whether the character ch is a number.
12. static boolean isIdentifierIgnorable(char ch): Determine whether the character ch is an ignorable character in the Unicode character set.
13. static boolean isISOControl(char ch): Determine whether the character ch is a control character in the ISO standard.
14.static boolean isJavaIdentifierPart(char ch): Determine whether the character ch is a partial identifier in Java.
15. static boolean isJavaIdentifierStart(char ch): Determine whether the character ch is the first identifier in Java.
16. static boolean isLetter(char ch): Determine whether the character ch is a letter.
17. static boolean isLetterOrDigit(char ch): Determine whether the character ch is a letter or number.
18. static boolean isLowerCase(char ch): Determine whether the character ch is a lowercase letter.
19. static boolean isMirrored(char c): Determine whether the character c has a character in the opposite direction according to the Unicode table. For example: "[" has "]" in the opposite direction, and the result is: true.
20. static boolean isSpaceChar(char ch): Determine whether the character ch is a space in Unicode.
21. static boolean isUpperCase(char ch): Determine whether the character ch is an uppercase letter.
22. static boolean isWhitespace(char ch): Determine whether the character ch is a null character in Java definition.
Code:
Including:

   char c1 = '\u0009';//水平列表符 
   char c2 = '\u000A';//换行 
   char c3 = '\u000B';//垂直列表符 
   char c4 = '\u000C';//换页 
   char c5 = '\u000D';//回车 
   char c6 = '\u
001
C';//文件分隔符 
   char c7 = '\u001D';//组分隔符 
   char c8 = '\u001E';//记录分隔符 
   char c9 = '\u001F';//单元分隔符

23. static char toLowerCase(char ch): Convert whether ch is lowercase.
24. String toString(): Convert the current Character object into a string.
25. static String toString(char c): This is a class method that converts c into a string.
26. static char toUpperCase(char ch): Convert whether ch is uppercase.
Code:

System.out.println("Character.toUpperCase('q'): " + Character.toUpperCase('q') );
System.out.println("Character.toLowerCaseCase('B'): " + Character.toLowerCase('B') );

The result is:

Character.toUpperCase('q'): Q 
Character.toLowerCaseCase('B'): b

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3. Explain in detail the Character class in Java

4. Instance analysis of the packaging class Character

5. About the usage analysis of Character class

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