语法错误，告诉我它想要的和其他几件事情 [英] Syntax error, telling me it wants ; and several other things
问题描述
只是尝试运行一些我正在做的作业的代码。这可能很简单，但对于我的生活我无法弄清楚为什么我在第一行得到上面的错误
（公共WaterLog .......）。
稍后我想通过这一行：
[log = new WaterLog（8，damCapacity）; ]
任何帮助将不胜感激，我对此很抱歉。
public class WaterLog（Integer windowSize，Integer maxEntry）{
private Integer size = windowSize;
private Integer max = maxEntry;
private ArrayList theLog（int windowSize）;
private int counter = 0;
public void addEntry（Integer newEntry）throws SimulationException {
theLog.add（0，newEntry）;
counter ++;
}
public整数getEntry（整型索引）throws SimulationException {
如果（thelog.isEmpty（）|| thelog.size（）< ; index）{
return null;
}
返回thelog.get（index）;
}
public整数变体（）throws SimulationException {
int old，recent = 0;
recent = thelog.get（0）;
old = thelog.get（thelog.size-1）;
返回近期;
}
public Integer numEntries（）{
return counter;
}
}
SimulationException 正确定义： WaterLog {
私人整数大小;
private整数最大;
private ArrayList< Integer> theLog; //参数化你的列表
private int counter = 0;
public WaterLog（Integer windowSize，Integer maxEntry）//这是您正在寻找的行为
{
this.size = windowSize;
this.max = maxEntry;
theLog = new ArrayList< Integer>（windowSize）;
}
public void addEntry（Integer newEntry）throws SimulationException {
theLog.add（0，newEntry）;
counter ++;
}
public Integer getEntry（Integer index）throws SimulationException {
if（theLog.isEmpty（）|| theLog.size（）< ; index）{// Java区分大小写
返回null;
}
返回log.get（index）;
}
public整数变体（）throws SimulationException {
int old，recent = 0;
recent = theLog.get（0）;
old = theLog.get（theLog.size（） - 1）; //再次，看表壳，也是大小是一个方法
返回近期;
}
public Integer numEntries（）{
return counter;
}
}
查看评论我补充说。
编辑：为了进一步解释发生了什么，让我们来看看你在做什么。
public class WaterLog（Integer windowSize，Integer maxEntry）{
private Integer size = windowSize;
private Integer max = maxEntry;
private ArrayList theLog（int windowSize）;
private int counter = 0;
你似乎已经将类与构造函数混淆了。您定义的变量是属性，这是正确的。您需要使用我在我的答案中显示的语法来创建一个构造函数。出于同样的原因，您无权访问变量，如 windowSize 。为了解决这个问题，我们允许他们在构造函数之外仍然定义，但在其中指定值，我们可以访问 windowSize 和 maxEntry 。
Just trying to run through some code for an assignment I'm doing. It is probably simple but for the life of me I can't figure out why I get the above error at the first line
(public WaterLog.......).
Later I want to pass it this line:
[ log = new WaterLog(8, damCapacity); ]
Any help would be appreciated, I am new to this sorry.
public class WaterLog(Integer windowSize, Integer maxEntry) {
private Integer size = windowSize;
private Integer max = maxEntry;
private ArrayList theLog(int windowSize);
private int counter = 0;
public void addEntry(Integer newEntry) throws SimulationException {
theLog.add(0, newEntry);
counter++;
}
public Integer getEntry(Integer index) throws SimulationException {
If (thelog.isEmpty() || thelog.size() < index) {
return null;
}
return thelog.get(index);
}
public Integer variation() throws SimulationException {
int old, recent = 0;
recent = thelog.get(0);
old = thelog.get(thelog.size-1);
return recent-old;
}
public Integer numEntries() {
return counter;
}
}
Assuming SimulationException is defined correctly:
class WaterLog{
private Integer size;
private Integer max ;
private ArrayList<Integer> theLog; //parameterize your lists
private int counter = 0;
public WaterLog(Integer windowSize, Integer maxEntry) //this is the behavior you were looking for
{
this.size = windowSize;
this.max = maxEntry;
theLog = new ArrayList<Integer>(windowSize);
}
public void addEntry(Integer newEntry) throws SimulationException {
theLog.add(0, newEntry);
counter++;
}
public Integer getEntry(Integer index) throws SimulationException {
if (theLog.isEmpty() || theLog.size() < index) { //Java is case sensitive
return null;
}
return theLog.get(index);
}
public Integer variation() throws SimulationException {
int old, recent = 0;
recent = theLog.get(0);
old = theLog.get(theLog.size()-1); //again, watch case, also size is a method
return recent-old;
}
public Integer numEntries() {
return counter;
}
}
See the comments I added.
EDIT: To explain a bit further what was going on, let's take a look at what you were doing.
public class WaterLog(Integer windowSize, Integer maxEntry) {
private Integer size = windowSize;
private Integer max = maxEntry;
private ArrayList theLog(int windowSize);
private int counter = 0;
You seem to have confused a class with a constructor. The variables you defined were attributes, which was correct. You needed to use the syntax I showed in my answer to create a constructor. For that same reason, you don't have access to variables like windowSize. To remedy this, we allow them to still be defined outside the constructor, but assigned values inside it, where we have access to windowSize and maxEntry.
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