replace
package testing.interview;
/**
* 参加某公司测试工程师面试被问到：如何替换字符串中的a、b为c
*
* @author lsjun
*/
public class CharReplace {
public static void main(String[] args) {
// TODO Auto-generated method stub
String source = "abcabc";
char[] from = { 'a', 'b' };
char to = 'c';
// 实现1
System.out.println(replace(source, from, to));
// 实现2
System.out.println(replace2(source, from, to));
// 实现3
System.out.println(replace3(source, from, to));
}
private static String replace3(String source, char[] from, char to) {
// String 的 replaceAll 方法不改变原来的值
// replaceAll 根据正则替换
source = source.replaceAll("[ab]", String.valueOf(to));
return source;
}
private static String replace2(String source, char[] from, char to) {
for (char c : from) {
// String 的 replace 方法不改变原来的值
source = source.replace(c, to);
}
return source;
}
private static char[] replace(String source, char[] from, char to) {
char[] tmp = source.toCharArray();
for (int i = 0; i < tmp.length; i++) {
if (charInarray(tmp[i], from)) {
tmp[i] = to;
}
}
return tmp;
}
private static boolean charInarray(char c, char[] from) {
for (char i : from) {
if (i == c)
return true;
}
return false;
}
}
