第一次真正使用任何与swing有关的东西-很抱歉代码太差，视觉效果太粗糙
将swing用于一个过于复杂的密码检查器学校项目，当我在JMenuBar中加载时，它第一次无法正确呈现。一旦我首先运行了其中一个选项，它就会正确地重新加载，但第一次它是这样出现的：第一次渲染尝试
但在我运行其中一个方法后，通过单击我添加的一个按钮来检查是否只是JFrame损坏了，或者使用损坏的菜单选项之一，它会正确地重新加载，但在JMenuBar实际渲染的上方有一个小灰条：Post方法渲染
视觉效果的代码如下：
public void draw_menu(){
this.parent.pack();
this.parent.setExtendedState(JFrame.MAXIMIZED_BOTH);
JButton check = new JButton("Check Password");
JButton generate = new JButton("Generate Password");
generate.addActionListener(e -> this.generator());
check.addActionListener(e -> this.char_checker());
check.setBounds(500,500, 170, 50);
generate.setBounds(500, 200, 170, 50);
this.parent.add(check);
this.parent.add(generate);
JMenu a = new JMenu("Check Password");
JMenu b = new JMenu("Generate Password");
JMenu c = new JMenu("Extra Codes");
JMenuItem a1 = new JMenuItem("Enter password >>>");
JMenuItem b1 = new JMenuItem("Generate >>>");
JMenuItem c1 = new JMenuItem("Valid >>>");
JMenuItem c2 = new JMenuItem("Why >>>");
a1.addActionListener(e -> this.char_checker());
b1.addActionListener(e -> this.generator());
c1.addActionListener(e -> JOptionPane.showMessageDialog(Password.this.parent, Arrays.asList(valid_chars).toString(), "Valid Characters", JOptionPane.PLAIN_MESSAGE));
c2.addActionListener(e -> this.why());
a.add(a1);
b.add(b1);
c.add(c1);
c.add(c2);
JMenuBar menuBar = new JMenuBar();
menuBar.add(a);
menuBar.add(b);
menuBar.add(c);
this.parent.setJMenuBar(menuBar);
this.parent.add(menuBar);
this.parent.setVisible(true);
}
如果你想让整个文件上下文化(并能够运行它(，你可以在下面查看它：
import java.awt.*;
import java.util.*;
import java.lang.*;
import java.util.List;
import java.util.concurrent.ThreadLocalRandom;
import javax.swing.*;
public class Password {
Scanner scanner;
String password;
Integer score;
List<Character> pass;
JFrame parent;
JLabel frameScore;
static Character[] valid_chars = {'!', '$', '%', '^', '&', '*', '(', ')', '-', '_', '=', '+'};
static Character[] lower_alpha = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'};
static Character[] upper_alpha = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'};
static Character[] valid_nums = {'1', '2', '3', '4', '5', '6', '7', '8', '9', '0'};
static String[] keyboard_combos = {"qwe", "wer", "ert", "rty", "tyu", "yui", "uio", "iop", "asd", "sdf", "dfg", "fgh", "gjh", "hjk", "jkl", "zxc", "xcv", "cvb", "vbn", "bnm"};
boolean num = false;
boolean upper = false;
boolean lower = false;
boolean character = false;
public Password() {
}
public void why() throws NullPointerException {
if (Objects.isNull(this.score)){
JOptionPane.showMessageDialog(parent, "Try checking a password first!", "Error!", JOptionPane.ERROR_MESSAGE);
System.out.println("Error -> this.score returns null!t|tTry checking a password first!");
this.draw_menu();
}
String out = "Your password achieved a score of "+this.score.toString()+" because you included ";
if (this.num){out = out.concat("at least one number, ");}
if (this.character){out = out.concat("at least one special character, ");}
if (this.upper){out = out.concat("at least one upper case letter, ");}
if (this.lower){out = out.concat("at least one lower case letter, ");}
out = out.concat("Achieving your score of: "+this.score.toString());
System.out.println(out);
JOptionPane.showMessageDialog(parent, out, "Score: "+this.score.toString(), JOptionPane.PLAIN_MESSAGE);
this.draw_menu();
}
public void char_checker() {
this.password = JOptionPane.showInputDialog(this.parent, "Enter your password:", null, JOptionPane.PLAIN_MESSAGE);
if (this.password.length() == 0) {
System.out.println("Error <- this.password.length() returns null!t|tTry entering a password!");
}
if (this.password.length() < 8 || this.password.length() > 24) {
System.out.println("Error <- this.password.length() exceeds bounds!t|t( [Bounds 7 < password < 24] String length = "+this.password.length()+")");
} else {
char[] pass_array = this.password.toCharArray();
for (Character temp : pass_array) {
if (Arrays.asList(valid_chars).contains(temp) || Arrays.asList(lower_alpha).contains(temp) || Arrays.asList(upper_alpha).contains(temp) || Arrays.asList(valid_nums).contains(temp)) {
System.out.print("valid placement @ temp:" + temp);
} else {
System.out.println("nError <- $temp: '" + temp + "' not found in character bank!t|tNot valid character (alphanumerical + valid_chars only)nEnter valid on menu for more information.");
this.draw_menu();
}
}
this.security_score(pass_array);
}
this.draw_menu();
}
public void security_score(char[] array){
if (!Objects.isNull(this.frameScore)){
this.frameScore.setText("");
}
this.num = false;
this.upper = false;
this.lower = false;
this.character = false;
System.out.println("nGenerating security score...");
this.score = 0;
this.score = this.password.length();
for (Character temp: array) {
if (Arrays.asList(valid_chars).contains(temp)) {
if (!this.character) {
this.score = this.score + 5;
this.character = true;
}
} else if (Arrays.asList(valid_nums).contains(temp)){
if (!this.num){
this.score = this.score + 5;
this.num = true;
}
} else if (Arrays.asList(lower_alpha).contains(temp)){
if (!this.lower){
this.score = this.score + 5;
this.lower = true;
}
} else if (Arrays.asList(upper_alpha).contains(temp)){
if (!this.upper){
this.score = this.score + 5;
this.upper = true;
}
}
}
if (this.lower && this.upper && this.character && this.num){
this.score = this.score + 10;
} else if (!this.character && !this.num) {
this.score = this.score - 5;
} else if (!this.character && !this.lower && !this.upper){
this.score = this.score - 5;
} else if (!this.lower && !this.upper && !this.num){
this.score = this.score - 5;
}
for (String temp : keyboard_combos){
if (this.password.contains(temp)) {
this.score = this.score - 5;
}
}
if (this.score > 20){
System.out.println("With a score of "+this.score+", your password is Strong.");
} else if (this.score < 20 && this.score > 0){
System.out.println("With a score of "+this.score+", your password is Average.");
} else {
System.out.println("With a score of "+this.score+", your password is Weak.");
}
System.out.println("To see why you achieved a score of "+this.score.toString()+", enter "why" on the menu!");
this.frameScore = new JLabel("<html>Your previous score was: "+this.score.toString()+"<br/>with:"+this.password+"</html>", SwingConstants.CENTER);
Dimension size = this.frameScore.getPreferredSize();
this.frameScore.setBounds(150, 100, size.width, size.height);
this.parent.setLayout(null);
this.parent.add(this.frameScore);
}
public void generator() {
if (!Objects.isNull(this.frameScore)){
this.frameScore.setText("");
}
if (!Objects.isNull(this.score)) {
this.frameScore = new JLabel("<html>Your previous score was: " + this.score + "<br/>with:" + this.password + "</html>", SwingConstants.CENTER);
}
this.pass.clear();
System.out.println("generating password...");
int length = ThreadLocalRandom.current().nextInt(8, 12);
System.out.println(length);
int count = 0;
int item;
while (count < length - 1){
int choice = ThreadLocalRandom.current().nextInt(1, 4);
switch (choice){
case 1:
item = ThreadLocalRandom.current().nextInt(0, valid_chars.length);
this.pass.add(valid_chars[item]);
count++;
case 2:
item = ThreadLocalRandom.current().nextInt(0, lower_alpha.length);
this.pass.add(lower_alpha[item]);
count++;
case 3:
item = ThreadLocalRandom.current().nextInt(0, upper_alpha.length);
this.pass.add(upper_alpha[item]);
count++;
case 4:
item = ThreadLocalRandom.current().nextInt(0, valid_nums.length);
this.pass.add(valid_nums[item]);
count++;
}
}
System.out.println("Your password is:");
char[] array = new char[this.pass.size()];
for (char temp : this.pass){
System.out.print(temp);
array[this.pass.indexOf(temp)] = this.pass.get(this.pass.indexOf(temp));
}
this.password = String.valueOf(array);
this.security_score(array);
System.out.println("Generation complete!");
if (this.score < 20){
this.generator();
}
JOptionPane.showMessageDialog(parent, "<html>Generation complete!<br/>"+this.password+"</html>", "Generated!", JOptionPane.INFORMATION_MESSAGE);
this.draw_menu();
}
//visual rendering code
public void draw_menu(){
this.parent.pack();
this.parent.setExtendedState(JFrame.MAXIMIZED_BOTH);
JButton check = new JButton("Check Password");
JButton generate = new JButton("Generate Password");
generate.addActionListener(e -> this.generator());
check.addActionListener(e -> this.char_checker());
check.setBounds(500,500, 170, 50);
generate.setBounds(500, 200, 170, 50);
this.parent.add(check);
this.parent.add(generate);
JMenu a = new JMenu("Check Password");
JMenu b = new JMenu("Generate Password");
JMenu c = new JMenu("Extra Codes");
JMenuItem a1 = new JMenuItem("Enter password >>>");
JMenuItem b1 = new JMenuItem("Generate >>>");
JMenuItem c1 = new JMenuItem("Valid >>>");
JMenuItem c2 = new JMenuItem("Why >>>");
a1.addActionListener(e -> this.char_checker());
b1.addActionListener(e -> this.generator());
c1.addActionListener(e -> JOptionPane.showMessageDialog(Password.this.parent, Arrays.asList(valid_chars).toString(), "Valid Characters", JOptionPane.PLAIN_MESSAGE));
c2.addActionListener(e -> this.why());
a.add(a1);
b.add(b1);
c.add(c1);
c.add(c2);
JMenuBar menuBar = new JMenuBar();
menuBar.add(a);
menuBar.add(b);
menuBar.add(c);
this.parent.setJMenuBar(menuBar);
this.parent.add(menuBar);
this.parent.setVisible(true);
}
public static void main(String[] args) {
Password user = new Password();
user.scanner = new Scanner(System.in);
user.pass = new ArrayList<>();
user.parent = new JFrame();
user.draw_menu();
}
}
提前感谢！
您应该将创建菜单与内容分开。请复习下面的例子。我将您的菜单、组件和事件逻辑解耦为有意义的阶段。
import java.util.*;
import javax.swing.*;
public class App implements Runnable {
private static final long serialVersionUID = 6924949643971067836L;
private static final Character[] VALID_CHARS = {'!', '$', '%', '^', '&', '*', '(', ')', '-', '_', '=', '+'};
private static final Character[] LOWER_ALPHA = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'};
private static final Character[] UPPER_ALPHA = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'};
private static final Character[] VALID_NUMS = {'1', '2', '3', '4', '5', '6', '7', '8', '9', '0'};
private static final String[] KEYBOARD_COMBOS = {"qwe", "wer", "ert", "rty", "tyu", "yui", "uio", "iop", "asd", "sdf", "dfg", "fgh", "gjh", "hjk", "jkl", "zxc", "xcv", "cvb", "vbn", "bnm"};
private Scanner scanner;
private String password;
private Integer score;
private List<Character> pass;
private JFrame parent;
private JLabel frameScore;
private boolean num = false;
private boolean upper = false;
private boolean lower = false;
private boolean character = false;
public App() { }
private void checkPassword() {
System.out.println("Checking password...");
}
private void generatePassword() {
System.out.println("Generating password...");
}
private void why() {
System.out.println("Why...");
}
protected JPanel createContent() {
JPanel mainPanel = new JPanel();
JButton check = new JButton("Check Password");
JButton generate = new JButton("Generate Password");
check.addActionListener(e -> this.checkPassword());
generate.addActionListener(e -> this.generatePassword());
check.setBounds(500,500, 170, 50);
generate.setBounds(500, 200, 170, 50);
mainPanel.add(check);
mainPanel.add(generate);
return mainPanel;
}
protected JMenuBar createMenu() {
JMenuBar menuBar = new JMenuBar();
JMenu checkPass = new JMenu("Check Password");
JMenu resetPass = new JMenu("Generate Password");
JMenu extraCodes = new JMenu("Extra Codes");
JMenuItem enterPass = new JMenuItem("Enter password >>>");
JMenuItem generatePass = new JMenuItem("Generate >>>");
JMenuItem verify = new JMenuItem("Valid >>>");
JMenuItem about = new JMenuItem("Why >>>");
enterPass.addActionListener(e -> this.checkPassword());
generatePass.addActionListener(e -> this.generatePassword());
verify.addActionListener(e -> JOptionPane.showMessageDialog(this.parent, Arrays.asList(VALID_CHARS).toString(), "Valid Characters", JOptionPane.PLAIN_MESSAGE));
about.addActionListener(e -> this.why());
menuBar.add(checkPass);
menuBar.add(resetPass);
menuBar.add(extraCodes);
checkPass.add(enterPass);
resetPass.add(generatePass);
extraCodes.add(verify);
extraCodes.add(about);
return menuBar;
}
@Override
public void run() {
this.parent = new JFrame();
this.parent.setJMenuBar(createMenu());
this.parent.setContentPane(createContent());
this.parent.pack();
this.parent.setLocationRelativeTo(null);
this.parent.setVisible(true);
}
public static void main(String[] args) {
try {
SwingUtilities.invokeAndWait(new App());
} catch (Exception e) {
e.printStackTrace();
}
}
}