（一）线程管理_2---获取和设置线程信息

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获取和设置线程信息

线程中包含一些属性

ID:线程ID

Name:

Prioity: 优先级，能够设置1到10 ，优先级由低到高；

status:线程状态，共有六个：new, runnable,blocked, waiting, time waiting, terminated

动手实现

public class Calculator implements Runnable {    private int number;    public Calculator(int number) {        this.number = number;    }    @Override    public void run() {        for (int i = 0; i < number; i++) {            System.out.printf("%s: %d\n", Thread.currentThread().getName(), i * number);        }    }    public static void main(String[] args) {        Thread threads[] = new Thread[10];        Thread.State status[] = new Thread.State[10];        for (int i = 0; i < 10; i++) {            threads[i] = new Thread(new Calculator(i));            if ((i % 2) == 0) {                threads[i].setPriority(Thread.MAX_PRIORITY);            } else {                threads[i].setPriority(Thread.MIN_PRIORITY);            }            threads[i].setName("Thread_" + i);        }        //将线程状态变化写入到文件        try (FileWriter fileWriter = new FileWriter("thread.log");             PrintWriter writer = new PrintWriter(fileWriter)) {            for (int i = 0; i < 10; i++) {                writer.println("Main : Status of Thread " + i + " : " + threads[i].getState());                status[i] = threads[i].getState();            }            for (int i = 0; i < 10; i++) {                threads[i].start();            }            boolean finish = false;            while (!finish) {                for (int i = 0; i < 10; i++) {                    if (threads[i].getState() != status[i]) {                        writeThreadInfo(writer, threads[i], status[i]);                        status[i] = threads[i].getState();                    }                }                finish = true;                for (int i = 0; i < 10; i++) {                    finish = finish && (threads[i].getState() == Thread.State.TERMINATED);                }            }        } catch (Exception e) {            e.printStackTrace();        }    }    private static void writeThreadInfo(PrintWriter pw, Thread thread, Thread.State state) {        pw.printf("Main : Id %d - %s\n", thread.getId(), thread.getName());        pw.printf("Main : Priority: %d\n", thread.getPriority());        pw.printf("Main : Old State: %s\n", state);        pw.printf("Main : New State: %s\n", thread.getState());        pw.printf("Main : ************************************\n");    }}

要点

当没有指定线程名称的时候，JVM自动为线程命名Thread-N （N为数字）；

如果使用setPriority()设置的优先级参数不合法，将会抛出IllegalArgumentException异常，正常值在1-10之间

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