About the instance analysis of the packaging class Character

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(&#39;A&#39;);<br/>		Character ch2 = new Character(&#39;A&#39;);<br/>		Character ch3 = Character.valueOf(&#39;C&#39;);<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(&#39;s&#39;);<br/>		System.out.println("bool3:" + bool3 + ", bool4:" + bool4);<br/>		char c4 = Character.toUpperCase(&#39;s&#39;);<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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