java实现带空格字符串的倒序输出
1 import org.junit.Test;2
3 public class StringtoChar {
4 @Test
5 public void main(){
6 String str ="hello world!";
7 // String str1 = str.trim();//trim()只是去掉首尾空格
8 String str1 = str.replace(" ", "");
9 //1:
10 System.out.println(str1);
11 System.out.println("第一种方法:");
12 for (int i = str1.length()-1; i >=0 ; i--) {
13 char ch=str1.charAt(i);
14 System.out.print(ch);
15 }
16
17 }
18 }
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1 import org.junit.Test;2
3 public class StringtoChar {
4 @Test
5 public void main(){
6 String str ="hello world!";
7 // String str1 = str.trim();//trim()只是去掉首尾空格
8 String str1 = str.replace(" ", "");
9
10 //2:
11 System.out.println();
12 System.out.println("第二种方法:");
13 char[] a = str1.toCharArray();
14 for (int i = str1.length()-1; i >=0 ; i--) {
15 System.out.print(a[i]);
16 }
17
18 }
19 }
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1 import org.junit.Test;2
3 public class StringtoChar {
4 @Test
5 public void main(){
6 System.out.println("第三种方法:");
7 StringBuffer s = new StringBuffer(" hello world !");
8 System.out.println("原始字符串"+s);
9 s.reverse();//字符串倒序
10 System.out.println("倒序字符串"+s);
11 String ss =s.toString();
12 String ss2 = ss.trim();//trim()只是去掉首尾空格
13 String ss3 = ss.replace(" ","");
14 System.out.println(ss2);
15 System.out.println(ss3);
16 }
17 }
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