java实现带空格字符串的倒序输出

java

 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 }

View Code

 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 }

View Code

 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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