我尝试了所有方法并浏览了许多论坛帖子，但找不到我的程序的问题。我试图在客户端类中使用程序中的方法，但它一直告诉我它找不到它。如果有人能帮我弄清楚，那就太好了。这是程序和错误:
import javax.swing.JOptionPane;
public class Palindrome {
private String palindrome;
public Palindrome(){
} // end constructor
public Palindrome(String newPalindrome){
palindrome = newPalindrome;
} // end Palindrome
public static boolean isPalindrome(){
String temp = "";
boolean toBe = true; // Is a palindrome
boolean notToBe = false; // Is not a palindrome
int low = 0; // First character
int high = temp.length() - 1; // Last character
while (low < high){
if (temp.charAt(low) != temp.charAt(high))
return notToBe;
low++;
high--;
} // end while
return toBe;
}// end isPalindrome
public static String filter(){
String palindrome = "";
StringBuilder stringBuilder = new StringBuilder(); // Create a string builder
for (int i = 0; i < palindrome.length(); i++) { // Examine each char in the string to skip alphanumeric char
if (Character.isLetterOrDigit(palindrome.charAt(i))) {
stringBuilder.append(palindrome.charAt(i));
} // end if
} // end for
// Return a new filtered string
return stringBuilder.toString();
} // end filter
public String removeWhite(){
String temp = "";
temp = temp.replaceAll("\\s+","");
return temp;
} // end removeWhite
public String lowerCase(){
String temp = "";
temp = temp.toLowerCase();
return temp;
} // end toLowerCase
} // end the class
这是客户端代码:
import java.util.Scanner;
import javax.swing.JOptionPane;
public class TestPalindrome {
public static void main(String args[]){
Palindrome pal = new Palindrome("") ;
Scanner input = new Scanner(System.in);
System.out.print("Enter a string: ");// Prompt the user to enter a string
String temporary = (input.nextLine());
String string = ("");
temporary = pal;
temporary.lowerCase();
string.removeWhite();
string.filter();
string.isPalindrome();
System.out.println(string);
} // end main method
} // end the class
错误:
TestPalindrome.java:30: error: incompatible types
temporary = pal;
^
required: String
found: Palindrome
TestPalindrome.java:31: error: cannot find symbol
temporary.lowerCase();
^
symbol: method lowerCase()
location: variable temporary of type String
TestPalindrome.java:32: error: cannot find symbol
string.removeWhite();
^
symbol: method removeWhite()
location: variable string of type String
TestPalindrome.java:33: error: cannot find symbol
string.filter();
^
symbol: method filter()
location: variable string of type String
TestPalindrome.java:34: error: cannot find symbol
string.isPalindrome();
^
symbol: method isPalindrome()
location: variable string of type String
5 errors
最佳答案
我改变了一些东西来完成这项工作!
> public class Palindrome {
private String palindrome;
public Palindrome() {
} // end constructor
public Palindrome(String newPalindrome) {
palindrome = newPalindrome;
} // end Palindrome
public static boolean isPalindrome(String string) {
String temp = string;
boolean toBe = true; // Is a palindrome
boolean notToBe = false; // Is not a palindrome
int low = 0; // First character
int high = temp.length() - 1; // Last character
while (low < high) {
if (temp.charAt(low) != temp.charAt(high))
return notToBe;
low++;
high--;
} // end while
return toBe;
}// end isPalindrome
public static String filter(String string) {
String palindrome = string;
StringBuilder stringBuilder = new StringBuilder(); // Create a string
// builder
for (int i = 0; i < palindrome.length(); i++) { // Examine each char in
// the string to skip
// alphanumeric char
if (Character.isLetterOrDigit(palindrome.charAt(i))) {
stringBuilder.append(palindrome.charAt(i));
} // end if
} // end for
// Return a new filtered string
return stringBuilder.toString();
} // end filter
public String removeWhite(String string) {
String temp = string;
temp = temp.replaceAll("\\s+", "");
return temp;
} // end removeWhite
public String lowerCase(String string) {
String temp = string;
temp = temp.toLowerCase();
return temp;
} // end toLowerCase
} // end the class
测试回文代码如下......
>package san.org.tst1;
import java.util.Scanner;
public class TestPalindrome {
public static void main(String args[]){
Palindrome pal = new Palindrome("") ;
Scanner input = new Scanner(System.in);
System.out.print("Enter a string: ");// Prompt the user to enter a string
String temporary = (input.nextLine());
String string = ("");
// temporary.toLowerCase();
String testIsLowercase = pal.lowerCase(string);
String removeWhitetest = pal.removeWhite(string);
String filter = pal.filter(string);
boolean testIspalindrome = pal.isPalindrome(string);
System.out.println(" removing lowercase : " + testIsLowercase);
System.out.println(" removing removeWhite : " + removeWhitetest);
System.out.println(" removing Filter : " + filter);
System.out.println("Is Palindrome : " + testIspalindrome);
} // end main method
} // end the class
关于java - java回文客户端程序错误"Cannot find symbol"，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/21520509/