小编Cor*_*gle的帖子

所以我试图测试是否有回文.这是我的代码:

此函数返回较大字符串的前半部分的字符串.("TEST"返回"TE","HELLO"返回"HE")

def takeStart(s):
    start = ""

    # The following determines the final index of the first half

    if len(s)%2==0:  
        a = (len(s)/2)-1
    else:
        a = ((len(s)-1)/2)-1

    for i in range(a):
        start+=s[i]
    return start

此函数返回较大字符串后半部分的字符串.("TEST"返回"ST","HELLO"返回"LO")

def takeEnd(s):  
    end = ""

    # The following determines the beginning index of the second half

    if len(s)%2==0:
        a = (len(s)/2)
    else:
        a = ((len(s)-1)/2)

    for i in range(a,len(s)):
        end+=s[i]
    return end

此函数翻转一个字符串.("TEST"返回"TSET","HELLO"返回"OLLEH")

def flip(s):
    flipped = ""
    for i in range(1,len(s)):
        flipped+=s[len(s)-i]
    flipped+=s[0]
    return …

所以我收到了错误 Class is not abstract and does not override abstract method actionPerformed(ActionEvent) in ActionListener

我知道这个错误的起源,但令我困惑的是我有这种方法.

public static ActionListener taskPerformer = new ActionListener(){
        public void actionPerformed(ActionEvent e){
        Clock cl = new Clock();
        if(seconds<59){
            seconds++;
        }else{
            seconds=0;
            if(minutes<59){
                minutes++;
            }else{
                minutes=0;
                if(hours<12){
                    hours++;
                }else{
                    hours=0;
                }
            }
        }

        cl.repaint();   
    }
};'

不太确定发生了什么.有帮助吗？提前致谢.

编辑:上下文包括导入和相关方法

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.lang.Object.*;
import java.text.DecimalFormat;
import java.awt.geom.*;


public class Clock extends JFrame implements ActionListener{
public static int seconds = 0;
public static int minutes …