java之字符

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‘; //错误，只能放一个字符
         
    }
}

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
         
    }
}

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
　　　　 System.out.println("a2="+a2);

　　　　 char c=‘a‘;
　　　　 String a3=Character.valueOf(c).toString();
　　　　 System.out.println("a3="+a3);

 } }

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");
    }
}