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法學研究Java 中的執行緒干擾錯誤
我們看一個示例，以瞭解執行緒干擾錯誤的概念：
示例
import java.io.*;
class Demo_instance{
static int val_1 = 6;
void increment_val(){
for(int j=1;j<11;j++){
val_1 = val_1 + 1;
System.out.println("The value of i after incrementing it is "+val_1);
}
}
void decrement_val(){
for(int j=1;j<11;j++){
val_1 = val_1 - 1;
System.out.println("The value of i after decrementing it is "+val_1);
}
}
}
public class Demo{
public static void main(String[] args){
System.out.println("Instance of Demo_instance created");
System.out.println("Thread instance created");
final Demo_instance my_inst = new Demo_instance();
Thread my_thread_1 = new Thread(){
@Override
public void run(){
my_inst.increment_val();
}
};
Thread my_thread_2 = new Thread(){
@Override
public void run(){
my_inst.decrement_val();
}
};
my_thread_1.start();
my_thread_2.start();
}
}輸出
Instance of Demo_instance created Thread instance created The value of i after incrementing it is 7 The value of i after incrementing it is 7 The value of i after decrementing it is 6 The value of i after incrementing it is 8 The value of i after decrementing it is 7 The value of i after incrementing it is 8 The value of i after incrementing it is 8 The value of i after decrementing it is 7 The value of i after incrementing it is 9 The value of i after decrementing it is 8 The value of i after decrementing it is 7 The value of i after decrementing it is 6 The value of i after decrementing it is 5 The value of i after decrementing it is 4 The value of i after decrementing it is 3 The value of i after decrementing it is 2 The value of i after incrementing it is 3 The value of i after incrementing it is 4 The value of i after incrementing it is 5 The value of i after incrementing it is 6
類“Demo_instance”定義了一個靜態值，和一個 void 函式“increment_val”，它會遍歷一組數字，並對其進行遞增並在控制檯上顯示。另一個名為“decrement_val”的函式會遍歷一組數字，並每次進行遞減並在控制檯上顯示輸出。
類 Demo 包含一個主函式，該函式建立類的例項，並建立一個新執行緒。該執行緒已被重寫，run 函式呼叫此物件例項。對於第二個執行緒，也執行了相同操作。這兩個執行緒隨後會被 start 函式呼叫。
更新於：2020 年 7 月 14 日
147 次瀏覽
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