这是一个模拟生产和消费的程序，为什么会出错
class Zhan{
private char[] date = new char[6];
private int cnt;
public synchronized void push(char ch){
while(cnt == date.length){
try{
this.wait();
}
catch(Exception e){
}
}
this.notify();
date[cnt] = ch;
++cnt;
System.out.printf("生产线程正在生产第%d个产品，这个产品是：%c\n",cnt,date[cnt]);
}
public synchronized int pop(){
while(cnt == 0){
try{
this.wait();
}
catch(Exception e){
}
}
this.notify();
--cnt;
System.out.printf("消费线程正在消费第%d个产品，这个产品是：%c\n",cnt+1,date[cnt]);
return cnt;
}
}
class Sheng implements Runnable{
Zhan z = null;
char ch;
public Sheng(Zhan z){
this.z = z;
}
public void run(){
for(int i = 0;i < 20;i++){
ch = (char)('a'+ i);
z.push(ch);
}
}
}
class Xiao implements Runnable{
Zhan z = null;
public Xiao(Zhan z){
this.z = z;
}
public void run(){
for(int i = 0;i < 20;i++){
z.pop();
}
}
}
class H{
public static void main(String[] args){
Zhan z = new Zhan();
Sheng s = new Sheng(z);
Xiao x = new Xiao(z);
Thread t1 = new Thread(s);
Thread t2 = new Thread(x);
t1.start();
t2.start();
}
}
------解决方案--------------------
class Zhan {
private char[] date = new char[6];
private int cnt;
public synchronized void push(char ch) {
while (cnt == date.length) {
try {
this.wait();
} catch (Exception e) {
}
}
this.notify();
date[cnt] = ch;
System.out.printf("生产线程正在生产第%d个产品，这个产品是：%c\n", cnt, date[cnt]);
cnt++;
}
public synchronized int pop() {
while (cnt == 0) {
try {
this.wait();
} catch (Exception e) {
}
}
this.notify();
--cnt;
System.out.printf("消费线程正在消费第%d个产品，这个产品是：%c\n", cnt + 1, date[cnt]);
return cnt;
}
}
class Sheng implements Runnable {
Zhan z = null;
char ch;
public Sheng(Zhan z) {
this.z = z;
}
public void run() {
for (int i = 0; i < 20; i++) {
ch = (char) ('a' + i);
z.push(ch);
}
}
}
class Xiao implements Runnable {
Zhan z = null;
public Xiao(Zhan z) {
this.z = z;
}
public void run() {
for (int i = 0; i < 20; i++) {
z.pop();
}
}
}
public class H {
public static void main(String[] args) {
Zhan z = new Zhan();
Sheng s = new Sheng(z);
Xiao x = new Xiao(z);
Thread t1 = new Thread(s);
Thread t2 = new Thread(x);
t1.start();
t2.start();
}
}
主要就是，就数组下标问题
------解决方案--------------------
- Java code
import java.util.ArrayList;import java.util.List;class Zhan{ private List<Character> date = new ArrayList<Character>(); private int cnt; private int MaxCount = 6; public synchronized void push(char ch) { while (cnt == MaxCount) { try { this.wait(); } catch (Exception e) { } } this.notify(); date.add(ch); cnt++; System.out.printf("生产线程正在生产第%d个产品，这个产品是:%c\n", cnt,date.get(cnt-1)); } public synchronized int pop(){ while (cnt == 0) { try { this.wait(); } catch (Exception e) { } } this.notify(); cnt--; System.out.printf("消费线程正在消费第%d个产品，这个产品是：%c\n", cnt+1,date.get(cnt)); date.remove(cnt); return cnt; } public void run() { }}class Sheng implements Runnable { Zhan z = null; char ch; public Sheng(Zhan z) { this.z = z; } public void run() { for (int i = 0; i < 20; i++){ ch = (char)('a' + i); z.push(ch); } }}class Xiao implements Runnable { Zhan z = null; public Xiao(Zhan z) { this.z = z; } public void run() { for (int i = 0; i < 20; i++){ z.pop(); } }}public class H { public static void main(String[] args) { Zhan z = new Zhan(); Sheng s = new Sheng(z); Xiao x = new Xiao(z); Thread t1 = new Thread(s); Thread t2 = new Thread(x); t1.start(); t2.start(); }}