java160116StringTest
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/**
* 联系一:去除字符串两端空格
*
* 联系er :将字符串反转
*/
package java160116;
/**
* @author LiZheng
*
*/
public class StringTest {
/**
* @param args
*/
public static void main(String[] args) {
// String string = " ab cd ed rfgghhj ";
//
// StringMethodDemo.sop("{" + string + "}");
//
// string = trim(string);
//
// StringMethodDemo.sop(string);
String string="1234sdfghj";
StringMethodDemo.sop(string);
String string2= reverseString(string);
StringMethodDemo.sop(string2);
String string3 =reverseString(string, 3, 5);
StringMethodDemo.sop(string3);
}
public static String trim(String string) {
int start = 0;
int end = string.length() - 1;
while (start <= end && string.charAt(start) == ' ') {
start++;
}
while (start <= end && string.charAt(end) == ' ') {
end--;
}
return string.substring(start, end + 1);
}
public static String reverseString(String string,int start,int end) {
char[] arr = string.toCharArray();
reverse(arr,start,end);
return new String(arr);
}
public static String reverseString(String string) {
return reverseString(string, 0, string.length());
}
private static void reverse(char[] arr, int xStar, int yEnd) {
for (int start = xStar, end = yEnd-1; start < end; start++, end--) {
swap(arr, start, end);
}
}
// private static void reverse(char[] arr) {
// for (int start = 0, end = arr.length - 1; start < end; start++, end--) {
// swap(arr, start, end);
// }
//
// }
private static void swap(char arr [],int start ,int end) {
char temp =arr[start];
arr[start]=arr[end];
arr[end]=temp;
}
}
* 联系一:去除字符串两端空格
*
* 联系er :将字符串反转
*/
package java160116;
/**
* @author LiZheng
*
*/
public class StringTest {
/**
* @param args
*/
public static void main(String[] args) {
// String string = " ab cd ed rfgghhj ";
//
// StringMethodDemo.sop("{" + string + "}");
//
// string = trim(string);
//
// StringMethodDemo.sop(string);
String string="1234sdfghj";
StringMethodDemo.sop(string);
String string2= reverseString(string);
StringMethodDemo.sop(string2);
String string3 =reverseString(string, 3, 5);
StringMethodDemo.sop(string3);
}
public static String trim(String string) {
int start = 0;
int end = string.length() - 1;
while (start <= end && string.charAt(start) == ' ') {
start++;
}
while (start <= end && string.charAt(end) == ' ') {
end--;
}
return string.substring(start, end + 1);
}
public static String reverseString(String string,int start,int end) {
char[] arr = string.toCharArray();
reverse(arr,start,end);
return new String(arr);
}
public static String reverseString(String string) {
return reverseString(string, 0, string.length());
}
private static void reverse(char[] arr, int xStar, int yEnd) {
for (int start = xStar, end = yEnd-1; start < end; start++, end--) {
swap(arr, start, end);
}
}
// private static void reverse(char[] arr) {
// for (int start = 0, end = arr.length - 1; start < end; start++, end--) {
// swap(arr, start, end);
// }
//
// }
private static void swap(char arr [],int start ,int end) {
char temp =arr[start];
arr[start]=arr[end];
arr[end]=temp;
}
}
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