Java 错误数组维度缺失
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Error array dimension missing
提问by Chimere Ibecheozor
I keep getting array dimension missing
我不断丢失数组维度
public static Planet[] readPlanets(String filename) {
allPlanets = new Planet[];
In in = new In (filename);
int nplanets = in.readInt();
double radius = in.readDouble();
for (int i = 0; i < allPlanets.length; i++) {
double pxxPos = in.readDouble();
double pyyPos = in.readDouble();
double pxxVel = in.readDouble();
double pyyVel = in.readDouble();
double pmass = in.readDouble();
String pimgFileName = in.readString();
}
return allPlanets;
}
Planet has six dimensions, and I have an array of multiple planets
行星有六个维度，我有多个行星的阵列
回答by null
You have to declare size of the array before you can use it's lengthattribute.
您必须先声明数组的大小，然后才能使用它的length属性。
For example:
例如：
allPlanets = new Planet[6];
回答by Jon Skeet
When you create an array, you have to specify the size. I strongly suspect you want:
创建数组时，必须指定大小。我强烈怀疑你想要：
In in = new In(filename);
int nPlanets = in.readInt();
allPlanets = new Planet[nPlanets];
Note that it's odd that you're assigning to a field and returning the reference from the method. It would be more usual to do one orthe other, e.g. use a local variable:
请注意，您分配给一个字段并从该方法返回引用是很奇怪的。做一个或另一个更常见，例如使用局部变量：
Planet[] planets = new Planet[nPlanets];
...
return planets;
And then assign to the field in the calling code:
然后分配给调用代码中的字段：
allPlanets = readPlanets(...);
