Question

我希望用Java lambda表达式替换下面的代码。在下面的例子中，我需要在找到匹配时出现循环并将boolean设置为true以断言条件

      Long teamId;
    boolean matchFound = false;
    List<WorkflowSubscriptions> workflowSubscriptionsList = fetchSubscriptions();
    for (WorkflowSubscriptions workflowSubscriptions : workflowSubscriptionsList) {
        for (WorkflowCompositeInfo workflowCompositeInfo : workflowSubscriptions.getWorkflowCompositeInfo()) {
            if (workflowCompositeInfo.getId() > 0 && workflowCompositeId == workflowCompositeId.intValue()) {
                teamId = Long.valueOf(workflowSubscriptions.getId());
                matchFound = true;
            }
        }
    }
    if (!matchFound) {
        throw new CustomParameterizedException("Workflow does not have valid subscriptions");
    }

Answer 1

试试这个：

fetchSubscriptions().stream()
    .filter(p -> w.getId() > 0 && workflowCompositeId == w.intValue())
    .limit(1)
    .forEach(w -> {teamId = Long.valueOf(w); matchFound = true;} );

<强>更新

避免修改最终变量的错误。您只需创建一个值类：

public class MyValue {
    public boolean matchFound;
    public Long teamId;
}

然后：

final MyValue value = new MyValue();

fetchSubscriptions().stream()
    .filter(p -> w.getId() > 0 && workflowCompositeId == w.intValue())
    .limit(1)
    .forEach(w -> {value.teamId = Long.valueOf(w); value.matchFound = true;}  );

// Here, find your data in value.teamId and value.matchFound

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