英文:
Reverse a sentence using StringBuilder
问题
public String reverseWords(String s) {int i = s.length() - 1;StringBuilder resultBuilder = new StringBuilder();while (i >= 0) {while (i >= 0 && s.charAt(i) == ' ') {i--;}if (i < 0) {break;}int j = i;while (j >= 0 && s.charAt(j) != ' ') {j--;}String word = s.substring(j + 1, i + 1);resultBuilder.append(word).append(' ');i = j;}return resultBuilder.toString().trim();}
英文:
The below code I used string as result and just reverse sentence for example input: " the sky is blue " and I get output:"blue is sky the". How I can use SpringBuilder instead String and then how I can reverse sentence and also words? example input: " the sky is blue " and I want this output "eulb is yks eht"
Please help me to modify the below code.
public String reverseWords(String s) {int i = 0;int j = 0;String result = "";while(s.length()>i){while(s.length()>i && s.charAt(i)==' '){i++;}if(i>=s.length()) break;j = i;while(s.length()>j && s.charAt(j)!=' '){j++;}String word = s.substring(i,j);result = word+" "+result;i = j;}return result.trim();}
答案1
得分: 0
你可以按以下方式使用StringBuilder：
String str = " the sky is blue ";str = str.replaceAll("\\s+", " ");StringBuilder sb = new StringBuilder(str.trim());System.out.println(sb.reverse().toString());
输出结果：
eulb si yks eht
英文:
You can use StringBuilder as follows:
String str = " the sky is blue ";str = str.replaceAll("\\s+", " ");StringBuilder sb = new StringBuilder(str.trim());System.out.println(sb.reverse().toString());
Output:
eulb si yks eht
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