如何比较java中的两个Arraylist值? [英] How to compare two Arraylist values in java?

问题描述

我有两个 Arraylist RunningProcessList AllProcessList 它包含以下值

I have Two Arraylist RunningProcessList AllProcessList its contains following values are

 RunningProcessList:
    Receiver.jar



 AllProcessList:
    Receiver.jar
    Sender.jar
    Timeout.jar
    TimeourServer.jar

AllProcessList arraylist 包含所有 java 进程，RunningProcessList arraylist 包含当前正在运行的进程.我想比较这两个数组列表，如果进程没有运行，我想显示.例如比较两个列表并希望显示以下进程未运行.

AllProcessList arraylist contains the all java processes , RunningProcessList arraylist contains currently running process. I want to compare these two arraylist and I want to display If the process is not running. For Example compare two list and want to display following process is not running.

 Result:
    Sender.jar
    Timeout.jar
    TimeourServer.jar

我使用了以下代码，但它不起作用.

I used the following code but its not working.

Object Result = null;
for (int i = 0; i <AllProcessList.size(); i++) {
   for (int j = 0; j < RunningProcessList.size(); j++) {
       if( AllProcessList.get(i) != ( RunningProcessList.get(j))) {
           System.out.println(  RunningProcessList.get(j)));
           Result =RunningProcessList.get(j);
       }
       if(AllProcessList.get(i) != ( RunningProcessList.get(j))) {
           list3.add(Result);
       }
    }
}

推荐答案

查看文档 List，特别是 removeAll() 方法.

Take a look at the documentation for List, ecpecially the removeAll() method.

List result = new ArrayList(AllProcessList);
result.removeAll(RunningProcessList);

然后您可以遍历该列表并根据需要调用 System.out.println，就像您在上面所做的那样......但这就是您想要做的吗?

You could then iterate over that list and call System.out.println if you wanted, as you've done above... but is that what you want to do?

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