我是新來的Java編程,並試圖編寫一個函數,排序數組。我知道我的代碼對於這樣一個簡單的任務來說非常強大,但這是我考慮排序的第一種方式,所以我只是隨它而行。我的邏輯是採取一個數組,使所有0的長度相同的數組。然後使用for循環找到未排序數組的最小值,將其放在新數組的開始位置,然後用未排序數組的最大值替換未排序數組的最小值,直到整個數組全部爲最大值,I'已經填充了要排序的數組。我將手跟蹤下面幾個例子,因爲它是一個有點難以解釋:在Java中編寫數組的排序功能,並卡住
-Starting Array:[2, 3, 1, 4]
-1st Execution: [2, 3, 1, 4] [0, 0, 0, 0]
-2nd: [2, 3, 4, 4] [1, 0, 0, 0]
-3rd: [4, 3, 4, 4] [1, 2, 0, 0]
-4th: [4, 4, 4, 4] [1, 2, 3, 0]
-5th: [4, 4, 4, 4] [1, 2, 3, 4]
我寫了返回數組的最小代碼,發現最小的指數,並返回數組的最大。我的目的是繼續這個過程並且保留for循環找到min的次數,然後當它等於數組長度-1時停止。我遇到了我的最後一個方法的問題 - sortMe - 因爲我的回報不會編譯和錯誤讀取:
Error: incompatible types
found : int[]
required: java.util.Arrays
我已經附上所有我下面的代碼:
import java.util.Arrays;
public class Homework4 {
public static void main (String[] args) {
int[] a = {20,2,5};
System.out.println(Homework4.minArray(a));
System.out.println(Homework4.maxArray(a));
System.out.println(Homework4.minIndex(a));
System.out.println(Arrays.toString(a));
}
/* 1 This method will mimic the sort methond for Arrays
* It will be called sortMe and will take in an array and produce a sorted array
* In order to do this I will also create two methods: min and max
* The numbers in the array will be of type Int
* Homework4.sortMe([0 , 3, 4, 2, 1, 7]) -> [0 , 1, 2, 3, 4, 7]
* Homework4.sortMe([0]) -> [0]
* Homework4.sortMe([3, 8, 2, 14, 1)] -> [1, 2, 3, 8, 14]
* Template:*/
public static int minArray (int[] x) { //Produces the Minimum of an Array
int minVal = x[0];
for (int i = 0; i < (x.length - 1); i = i + 1) {
if(x[i] < minVal) {
minVal = x[i];}
}
return minVal;}
public static int minIndex (int[] x) { //Returns the index of the Minimum
int minVal = x[0];
int index = 0;
for (int i = 0; i < (x.length - 1); i = i + 1) {
if(x[i] < minVal) {
minVal = x[i];
index = i;}
}
return index;}
public static int maxArray (int[] x) { //Produces the Maximum of an Array
int maxVal = x[0];
for (int i = 0; i < (x.length - 1); i = i + 1) {
if(x[i] > maxVal) {
maxVal = x[i];}
}
return maxVal;}
public static Arrays sortMe (int[] x) { //Sorts an Array
int[] sortedArray = new int [x.length];
int minIterations = 0;
while (minIterations < x.length-1) {
for(int i = 0; i < x.length-1; i = i +1){
sortedArray[i] = Homework4.minArray(x);
x[Homework4.minIndex(x)] = Homework4.maxArray(x);
minIterations++;
}}
return sortedArray; }
}
謝謝!
指定發生錯誤的行。 – SanVed
'公共靜態數組sortMe'你的方法說它返回類型'Arrays',但你試圖返回類型'int []'。 – csmckelvey
請注意,這被稱爲「插入排序」。 – chrylis