小编use*_*506的帖子

import java.awt.Canvas;

public class GSM extends Canvas implements Runnable {

//The game state manager

public final long secondNS = 1000000000;
public final long frameNS = secondNS/60;
public boolean running = true;
public long now = System.nanoTime();
public long startTime = now;
public long lastFrame = now;
public long lastSecond = now;
public int frames = 0;

public void run() 
{

    System.out.println("Program started.");
    while(running)
    {
        now = System.nanoTime();
        if(now - lastFrame >= frameNS)
        {
            lastFrame = now;
            frames++;
        }
        if(now - …

public double accessor(int n)
{
    switch(n)
    {
    case 0:
        return this.a;
        break;
    case 1:
        return this.b;
        break;
    case 2:
        return this.c;
        break;
    case 3:
        return this.d;
        break;
    case 4:
        return this.e;
        break;
    }
}

a,b,c,d,e都是double类型,但它告诉我break语句是不可达的,我必须返回一个double类型.我是java新手,如果这听起来很愚蠢,请原谅