1.Construction method:
##Character ch1 = new Character( 'A');
Create a Character object with a char type variable as a parameter;
2. Commonly used methods:
The Character class provides many methods to complete operations on characters:
①charValue(): Return value type: char;
##Function description: Return Character object value.
②compareTo(Character anotherCharacter): Return value type: int
Function Description: Compare two Character objects, return 0 if they are equal, return a negative value if the calling object is smaller than anotherCharacter object,
Otherwise return a positive value
③equals(Character anotherCharacter): Return value type: boolean
Function Description: Compare two Character objects, return true if they are equal, otherwise return false.
④toUpperCase(char ch): Convert character parameters to uppercase (requires parameters)
⑤toLowerCase(char ch): Convert character parameters to lowercase ()
⑥toString (): Return value type: String
Function description: There are three calling methods:
1.String str = Character.toString('A');
##2.Character ch = Character.valueOf('A');String str = Character.toString(ch);
##3
.Character ch = Character.valueOf('A');
String str = ch.toString();
##⑦isUpperCase(char ch): Return value type: boolean
Function description: Determine whether the specified character is uppercase (requires parameters)
⑧isLowerCase (char ch): Return type: boolean
Function description: Determine whether the specified character is lowercase (requires parameters)
##⑨valueOf(char ch);Return value type: Character object
Function description: Return the Character object whose value is ch.
#Note: The parameter can only be of char type, not String type.
eg:
##<span style="font-size: 14px;">package Number;<br/>public class IntFunction{<br/> public static void main (String []args)<br/> {<br/> Character ch1 = Character.valueOf('A');<br/> Character ch2 = new Character('A');<br/> Character ch3 = Character.valueOf('C');<br/> char c1 = ch1.charValue();<br/> char c2 = ch2.charValue();<br/> char c3 = ch3.charValue();<br/> System.out.println("ch1:" + c1 + ", ch2:" + c2 + ", ch3:" + c3);<br/> int a1 = ch1.compareTo(ch2);<br/> int a2 = ch1.compareTo(ch3);<br/> System.out.println("ch1.compareTo(ch2):" + a1 + ", ch1.compareTo(ch3):" + a2);<br/> boolean bool1 = ch1.equals(ch2);<br/> boolean bool2 = ch1.equals(ch3);<br/> System.out.println("ch1.equals(ch2): " + bool1 + ", ch1.equals(ch3): " + bool2);<br/> boolean bool3 = Character.isUpperCase(ch1);<br/> boolean bool4 = Character.isUpperCase('s');<br/> System.out.println("bool3:" + bool3 + ", bool4:" + bool4);<br/> char c4 = Character.toUpperCase('s');<br/> Character c5 = Character.toLowerCase(ch1);<br/> System.out.println("c4:" + c4 + ", c5:" + c5);<br/> } <br/>}<br/>/*运行结果:<br/>ch1:A, ch2:A, ch3:C<br/>ch1.compareTo(ch2):0, ch1.compareTo(ch3):-2<br/>ch1.equals(ch2): true, ch1.equals(ch3): false<br/>bool3:true, bool4:false<br/>c4:S, c5:a<br/>*/<br/></span>
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