java - 确定哪个条件导致 if 语句执行

Question

所以我有一个如下所示的 if 语句:

List<Integer> portsInUse = new ArrayList<Integer>();
. . .
if(portsInUse.contains((Integer) newPort1) 
        || portsInUse.contains((Integer) newPort2){

    fail(_____, "This port is already in use.");
}

newPort1 和 newPort2 是通过从 HttpServletRequest 中挖掘出来分配的。 fail(String parameter, String message) 是一种内部方法，用于提醒用户出现问题。

我想做的是能够判断是哪个条件导致 if 语句触发，然后相应地设置失败消息。我可以这样做吗，还是我必须这样做:

List<Integer> portsInUse = new ArrayList<Integer>();
. . .
boolean port1 = portsInUse.contains((Integer) newPort1);
boolean port2 = portsInUse.contains((Integer) newPort2);
if(port1 || port2){
    if(port1)
        fail("newPort1", "This port is already in use.");
    else
        fail("newPort2", "This port is already in use.");
}

或者，第三个选项，我是否应该像这样分解条件:

List<Integer> portsInUse = new ArrayList<Integer>();
. . .
if(portsInUse.contains((Integer) newPort1) {
    fail("newPort1", "This port is already in use.");
}
if(portsInUse.contains((Integer) newPort2) {
    fail("newPort2", "This port is already in use.");
}

我确定我把事情复杂化了，但提前谢谢你。

Answer 1

第四个选项...

List<Integer> portsInUse = new ArrayList<Integer>();
. . .
if(portsInUse.contains((Integer) newPort1) {
    fail("newPort1", "This port is already in use.");
}
else if(portsInUse.contains((Integer) newPort2) {
    fail("newPort2", "This port is already in use.");
}else{
    //No ports in use
}

第五个选项...

List<Integer> portsInUse = new ArrayList<Integer>();
. . .
if(portsInUse.contains((Integer) newPort1) {
    if(portsInUse.contains((Integer) newPort2) {
        //both ports in use
    }else{
        //port 1 in use
    }
}
else if(portsInUse.contains((Integer) newPort2) {
    //Port 2 in use
}else{
    //No ports in use
}