去掉字符串中间的空格
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2024-01-20 17:59:28
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/**
* Created by king on 2017/5/8.
* 功能:去掉中间的空格,保留两边的空格。
*/
public class Trimid {
public static void main(String[] args) {
String a1 = " asd fa sdf ";
String a2 = " asd fa sdf";
String a3 = "asd fa sdf ";
String a4 = " asdfasdf ";
String a5 = "asdfasdf";
String a6 = " ";
System.out.println("--->" + trimid(a1) + "<---");
System.out.println("--->" + trimid(a2) + "<---");
System.out.println("--->" + trimid(a3) + "<---");
System.out.println("--->" + trimid(a4) + "<---");
System.out.println("--->" + trimid(a5) + "<---");
System.out.println("--->" + trimid(a6) + "<---");
}
private static String trimid(String a) {
int start = 0;
int end = a.length() - 1;
StringBuilder sb = new StringBuilder();
while (start < end && a.charAt(start) == ' ') start++;
while (start < end && a.charAt(end) == ' ') end--;
int i = start;
int j = start;
for (; i < end; i++) {
if (a.charAt(i) != ' ' && a.charAt(i + 1) == ' ') {
sb.append(a.substring(start, i + 1));
}
if (a.charAt(i) == ' ' && a.charAt(i + 1) != ' ') {
start = i + 1;
}
}
sb.append(a.substring(start, a.length())).insert(0, a.substring(0, j));
return sb.toString();
}
}
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