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ÓÃstringBufferÀ࣬
String s = "sdds";
StringBuffer sb1 = new StringBuffer(s);
StringBuffer sb2 = sb1.reverse();
System.out.println(sb2.toString().equals(s));

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Java code:
public class Test {
public static void main(String[] args) {
System.out.println(f("abcdcba"));
System.out.println(f("abccba"));
System.out.println(f("abcddba"));
}
private static boolean f(String s){
int n=s.length();
for(int i=0;i<n-1-i;i++){
if(s.charAt(i)!=s.charAt(n-1-i)){
return false;
}
}
return true;
}
}



Java code:

class Test{
public static void main(String[] args){
String str = "123321";
System..out.println(huiwen(str));
}
private boolean huiwen(String str){
for(int i=0;i<str.length();i++){


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