我试图弄清楚为什么我的IDE提醒我这一点:
Incompatible types: required T[], found T[]
。
代码在以下代码段中:
public abstract class SearcherGenerics<T extends Comparable<? super T>> {
private T[] array;
private int k;
SearcherGenerics(T[] array, int k) {
this.array = array;
this.k = k;
}
public <T extends Comparable<? super T>> T[] getArray() {
return array;
}
int getIndex() { return k; }
abstract public <T extends Comparable<? super T>> T findElement() throws IndexingError;
}
扩展了SearcherGenerics的CleverSearcherGenerics:
public class CleverSearcherGenerics<T extends Comparable<? super T>> extends SearcherGenerics<T> {
CleverSearcherGenerics(T[] array, int k) {
super(array, k);
}
@Override
public <T extends Comparable<? super T>> T findElement() throws IndexingError {
T[] bigArray = getArray();
int k = getIndex();
if (k <= 0 || k > bigArray.length) {
throw new IndexingError();
}
T[] smallArray = Arrays.copyOfRange(bigArray, 0, k);
Arrays.sort(smallArray);
for (int i = k; i < bigArray.length; i++) {
if (bigArray[i].compareTo(smallArray[0]) > 0){
smallArray[0] = bigArray[i];
int j = 0;
while ((j < k - 1) && (smallArray[j].compareTo(smallArray[j + 1]) > 0)) {
T temp = smallArray[j];
smallArray[j] = smallArray[j + 1];
smallArray[j + 1] = temp;
j++;
}
}
}
return smallArray[0];
}
}
答案 0 :(得分:3)
不需要方法getArray()
和findElement()
中的新通用定义。您已经在课程级别定义了T
。如下定义您的方法:
public T[] getArray() {
return array;
}
abstract public T findElement() throws IndexingError;