步骤1:保存一个字符的时候使用char
步骤2:char对应的封装类
步骤3:Character常见方法
步骤4:常见转义
步骤5:练习-Character
步骤6:答案-Character
示例 1 : 保存一个字符的时候使用char
package character;
public class TestChar {
public static void main(String[] args) {
char c1 = 'a' ;
char c2 = '1' ; //字符1,而非数字1
char c3 = '中' ; //汉字字符
char c4 = 'ab' ; //只能放一个字符
}
}
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示例 2 : char对应的封装类
char对应的封装类是Character
装箱拆箱概念,参考 拆箱装箱
package character;
public class TestChar {
public static void main(String[] args) {
char c1 = 'a' ;
Character c = c1; //自动装箱
c1 = c; //自动拆箱
}
}
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示例 3 : Character常见方法
package character;
public class TestChar {
public static void main(String[] args) {
System.out.println(Character.isLetter( 'a' )); //判断是否为字母
System.out.println(Character.isDigit( 'a' )); //判断是否为数字
System.out.println(Character.isWhitespace( ' ' )); //是否是空白
System.out.println(Character.isUpperCase( 'a' )); //是否是大写
System.out.println(Character.isLowerCase( 'a' )); //是否是小写
System.out.println(Character.toUpperCase( 'a' )); //转换为大写
System.out.println(Character.toLowerCase( 'A' )); //转换为小写
String a = 'a' ; //不能够直接把一个字符转换成字符串
String a2 = Character.toString( 'a' ); //转换为字符串
}
}
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示例 4 : 常见转义
![常见转义](https://imgconvert.csdnimg.cn/aHR0cHM6Ly9zdGVwaW1hZ2V3bS5ob3cyai5jbi82OTYucG5n?x-oss-process=image/format,png)
package character;
public class TestChar {
public static void main(String[] args) {
System.out.println( "使用空格无法达到对齐的效果" );
System.out.println( "abc def" );
System.out.println( "ab def" );
System.out.println( "a def" );
System.out.println( "使用\\t制表符可以达到对齐的效果" );
System.out.println( "abc\tdef" );
System.out.println( "ab\tdef" );
System.out.println( "a\tdef" );
System.out.println( "一个\\t制表符长度是8" );
System.out.println( "12345678def" );
System.out.println( "换行符 \\n" );
System.out.println( "abc\ndef" );
System.out.println( "单引号 \\'" );
System.out.println( "abc\'def" );
System.out.println( "双引号 \\\"" );
System.out.println( "abc\"def" );
System.out.println( "反斜杠本身 \\" );
System.out.println( "abc\\def" );
}
}
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