Java任务统计实现方法详解

public class Task {
    private String name;
    private boolean completed;
public Task(String name, boolean completed) {
    this.name = name;
    this.completed = completed;
}

public boolean isCompleted() {
    return completed;
}

// 可添加 getter 和 setter 方法
}

import java.util.*;
public class TaskStatistics {
private List tasks = new ArrayList<>();
public void addTask(Task task) {
    tasks.add(task);
}

public int getTotalCount() {
    return tasks.size();
}

public int getCompletedCount() {
    int count = 0;
    for (Task task : tasks) {
        if (task.isCompleted()) {
            count++;
        }
    }
    return count;
}

public double getCompletionRate() {
    if (tasks.isEmpty()) return 0.0;
    return (double) getCompletedCount() / getTotalCount();
}
}

public class Main {
    public static void main(String[] args) {
        TaskStatistics stats = new TaskStatistics();
    stats.addTask(new Task("编写文档", true));
    stats.addTask(new Task("测试代码", false));
    stats.addTask(new Task("修复bug", true));

    System.out.println("总任务数: " + stats.getTotalCount());
    System.out.println("已完成任务: " + stats.getCompletedCount());
    System.out.println("完成率: " + String.format("%.2f%%", stats.getCompletionRate() * 100));
}
}

long completed = tasks.stream().filter(Task::isCompleted).count();