Java实现银行家算法界面展示
时间: 2024-06-20 22:02:06 浏览: 206
银行家算法是一种资源分配算法,用于解决并发系统的死锁问题,主要用于内存管理,特别是在多线程环境下。在Java中实现银行家算法的界面展示,通常会设计一个用户界面让用户输入请求(如进程的资源需求和当前系统的资源状态),然后显示算法的决策结果(是否能安全分配资源、系统是否会进入死锁等信息)。
下面是一个简单的伪代码描述银行家算法界面展示的基本步骤:
1. **界面初始化**:
- 创建控制台或图形界面,显示进程列表、当前资源分配、最大资源量、剩余资源量等信息。
2. **用户输入**:
- 用户输入进程ID、资源需求和当前已经分配的资源。
3. **数据验证**:
- 检查用户输入的合法性,如资源请求是否合理,是否可能导致死锁。
4. **算法执行**:
- 调用银行家算法的核心逻辑,如使用矩阵方法或循环检测算法检查安全序列。
5. **结果显示**:
- 显示算法的响应,比如是否分配资源、分配哪些资源、系统是否处于安全状态或是否存在死锁。
6. **交互循环**:
- 如果系统安全,允许用户继续输入新的请求;如果系统不安全,则给出警告并提示可能的死锁原因。
相关问题
java实现银行家算法界面
以下是一个简单的 Java 界面实现银行家算法的例子:
```java
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class BankerAlgorithm implements ActionListener {
JFrame frame;
JLabel processesLabel, resourcesLabel, allocationLabel, maxLabel, availableLabel, resultLabel;
JTextField processesField, resourcesField, availableField;
JPanel inputPanel, allocationPanel, maxPanel, availablePanel, resultPanel, buttonPanel;
JButton runButton, resetButton;
JTextField[][] allocationFields, maxFields;
int[][] allocation, max, need, available;
int[] processes, resources;
public BankerAlgorithm() {
frame = new JFrame("银行家算法");
processesLabel = new JLabel("进程数:");
resourcesLabel = new JLabel("资源数:");
allocationLabel = new JLabel("已分配矩阵:");
maxLabel = new JLabel("最大需求矩阵:");
availableLabel = new JLabel("可用资源数:");
resultLabel = new JLabel("");
processesField = new JTextField(5);
resourcesField = new JTextField(5);
availableField = new JTextField(5);
runButton = new JButton("运行");
runButton.addActionListener(this);
resetButton = new JButton("重置");
resetButton.addActionListener(this);
inputPanel = new JPanel(new GridLayout(1, 4));
inputPanel.add(processesLabel);
inputPanel.add(processesField);
inputPanel.add(resourcesLabel);
inputPanel.add(resourcesField);
allocationPanel = new JPanel();
maxPanel = new JPanel();
availablePanel = new JPanel(new GridLayout(1, 2));
resultPanel = new JPanel();
buttonPanel = new JPanel(new GridLayout(1, 2));
frame.add(inputPanel, BorderLayout.NORTH);
frame.add(allocationPanel, BorderLayout.WEST);
frame.add(maxPanel, BorderLayout.EAST);
frame.add(availablePanel, BorderLayout.SOUTH);
frame.add(resultPanel, BorderLayout.CENTER);
frame.add(buttonPanel, BorderLayout.SOUTH);
frame.setSize(600, 400);
frame.setVisible(true);
}
public void actionPerformed(ActionEvent e) {
if (e.getSource() == runButton) {
int n = Integer.parseInt(processesField.getText());
int m = Integer.parseInt(resourcesField.getText());
allocation = new int[n][m];
max = new int[n][m];
need = new int[n][m];
available = new int[1][m];
processes = new int[n];
resources = new int[m];
allocationPanel.removeAll();
allocationPanel.setLayout(new GridLayout(n + 1, m + 1));
allocationFields = new JTextField[n][m];
allocationPanel.add(new JLabel(""));
for (int j = 0; j < m; j++) {
allocationPanel.add(new JLabel("资源 " + (j + 1)));
}
for (int i = 0; i < n; i++) {
allocationPanel.add(new JLabel("进程 " + (i + 1)));
for (int j = 0; j < m; j++) {
allocationFields[i][j] = new JTextField(5);
allocationPanel.add(allocationFields[i][j]);
}
}
maxPanel.removeAll();
maxPanel.setLayout(new GridLayout(n + 1, m + 1));
maxFields = new JTextField[n][m];
maxPanel.add(new JLabel(""));
for (int j = 0; j < m; j++) {
maxPanel.add(new JLabel("资源 " + (j + 1)));
}
for (int i = 0; i < n; i++) {
maxPanel.add(new JLabel("进程 " + (i + 1)));
for (int j = 0; j < m; j++) {
maxFields[i][j] = new JTextField(5);
maxPanel.add(maxFields[i][j]);
}
}
available[0] = new int[m];
String[] availableValues = availableField.getText().split(",");
for (int i = 0; i < m; i++) {
available[0][i] = Integer.parseInt(availableValues[i]);
}
for (int i = 0; i < n; i++) {
processes[i] = i;
for (int j = 0; j < m; j++) {
allocation[i][j] = Integer.parseInt(allocationFields[i][j].getText());
max[i][j] = Integer.parseInt(maxFields[i][j].getText());
need[i][j] = max[i][j] - allocation[i][j];
}
}
for (int i = 0; i < m; i++) {
resources[i] = 0;
for (int j = 0; j < n; j++) {
resources[i] += allocation[j][i];
}
available[0][i] -= resources[i];
}
if (isSafeState(n, m)) {
resultLabel.setText("系统处于安全状态!");
} else {
resultLabel.setText("系统处于不安全状态!");
}
} else if (e.getSource() == resetButton) {
processesField.setText("");
resourcesField.setText("");
availableField.setText("");
allocationPanel.removeAll();
maxPanel.removeAll();
resultLabel.setText("");
}
}
public boolean isSafeState(int n, int m) {
int[][] work = new int[1][m];
for (int i = 0; i < m; i++) {
work[0][i] = available[0][i];
}
boolean[] finish = new boolean[n];
for (int i = 0; i < n; i++) {
finish[i] = false;
}
int count = 0;
while (count < n) {
boolean found = false;
for (int i = 0; i < n; i++) {
if (!finish[i]) {
boolean notEnoughResources = false;
for (int j = 0; j < m; j++) {
if (need[i][j] > work[0][j]) {
notEnoughResources = true;
break;
}
}
if (!notEnoughResources) {
for (int j = 0; j < m; j++) {
work[0][j] += allocation[i][j];
}
finish[i] = true;
found = true;
count++;
}
}
}
if (!found) {
return false;
}
}
return true;
}
public static void main(String[] args) {
new BankerAlgorithm();
}
}
```
这个界面包括了进程数、资源数、已分配矩阵、最大需求矩阵和可用资源数的输入框,以及运行和重置按钮。在输入数据后,点击运行按钮会调用 `isSafeState` 方法来判断系统是否处于安全状态,并在界面上显示结果。
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