[英]to check whether a string is palindrome or not using java
import java.util.Scanner;
public class palindrome{
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
String str = sc.nextLine();
String rev;
for(int i=str.length()-1,k=0;i>=0 && k<str.length();i--,k++)
{
rev.charAt(k) = str.charAt(i);
}
if(rev==str)
System.out.println("string is palidrome");
else
System.out.println("string is not palindrome");
}
}
这段代码有什么问题? 注意:错误显示在以下代码行 rev.charAt(k)=str.charAt(i);
.charAt(k) 不返回位置,它只告诉您那里是什么字符。
回文程序示例代码
import java.util.*;
class PalindromeExample2
{
public static void main(String args[])
{
String original, reverse = ""; // Objects of String class
Scanner in = new Scanner(System.in);
System.out.println("Enter a string/number to check if it is a palindrome");
original = in.nextLine();
int length = original.length();
for ( int i = length - 1; i >= 0; i-- )
reverse = reverse + original.charAt(i);
if (original.equals(reverse))
System.out.println("Entered string/number is a palindrome.");
else
System.out.println("Entered string/number isn't a palindrome.");
}
}
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