使用匿名比较器的 ArraySort 会出错

Question

错误：javac说它不适用，我不知道为什么？

请帮助我在这里缺少的概念。

>> ROOT: }     Search_In_2D_Matrix.java:50: error: no suitable method found for sort(int[],<anonymous Comparator<Integer>>)
Arrays.sort(arr, new Comparator<Integer>() {
^
method Arrays.<T#1>sort(T#1[],Comparator<? super T#1>) is not applicable
(inference variable T#1 has incompatible bounds
equality constraints: int
upper bounds: Integer,Object)
method Arrays.<T#2>sort(T#2[],int,int,Comparator<? super T#2>) is not applicable
(cannot infer type-variable(s) T#2
(actual and formal argument lists differ in length))
where T#1,T#2 are type-variables:
T#1 extends Object declared in method <T#1>sort(T#1[],Comparator<? super T#1>)
T#2 extends Object declared in method <T#2>sort(T#2[],int,int,Comparator<? super T#2>)
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
1 error

//--------------------------------------------------

public static void name() {
int arr[] = new int[] { 9, 8, 7, 6, 5, 4, 3, 2, 1 };
Arrays.binarySearch(arr, -1, new Comparator<Integer>() {
@Override
public int compare(Integer a, Integer b) {
return a - b;
}
});
Arrays.sort(arr, new Comparator<Integer>() {
@Override
public int compare(Integer a, Integer b) {
return a.intValue() - b.intValue();
}
});
}

Answer 1

采用Comparator的方法适用于对象数组。对于基元数组，您没有该选项。

你可以把你的int[]变成Integer[]然后它就会起作用。