package com.ctu.java.exer;public class TestArray {public static void main(String[] args) {int[] arr = new int[]{12,4,76,0,-98,-54,4,100};ArrayUtil au = new ArrayUtil();int max = au.getMax(arr);System.out.println("最大值为：" + max);int avg = au.avg(arr);System.out.println("平均值为：" + avg);au.printArray(arr);System.out.println("反转数组：" );au.reverse(arr);au.printArray(arr);System.out.println("对数组排序：");au.sort(arr,"asc");au.printArray(arr);// TODO Auto-generated method stub}
package com.ctu.java.exer;public class ArrayUtil {
public int getMax(int[] arr){
int max = arr[0];
for(int i = 1; i < arr.length;i++){
if(max < arr[i]){
max = arr[i];
}
}
return max;
}
public int getMin(int[] arr){
int min  = arr[0];
for(int i = 1; i < arr.length;i++){
if(min > arr[i]){
min = arr[i];
}
}
return min ;
}
public void printArray(int[] arr){
System.out.print("[");
for(int i = 0; i < arr.length;i++){
System.out.print(arr[i]+ "\t");
}
System.out.println("]");
}
public int avg(int[] arr){
int sum = getSum(arr);
return sum/arr.length;
}
public int getSum(int[] arr){
int sum = 0;
for(int i =0 ; i < arr.length;i++){
sum +=arr[i];
}
return sum;
}
public int[] reverse(int[] arr){
for(int x = 0,y = arr.length -1; x<y;x++,y--){
int temp = arr[x];
arr[x] = arr[y];
arr[y] = temp;
}
return arr ;
}
public int[] copy(int[] arr){
int[] arr1 = new int [arr.length];
for(int i = 0; i < arr.length ;i++){
arr1[i] = arr[i];
}
return arr1;
}
public void sort(int[] arr,String desc){
if(desc == "asc"){
for(int i = 0; i < arr.length-1;i++){
for(int j = 0;j < arr.length - 1 -i;j++){if(arr[j] > arr[j + 1]){
swap(arr,j,j+1);
}
}
}
}else if(desc == "desc"){
for(int i = 0; i < arr.length-1;i++){
for(int j = 0;j < arr.length - 1 -i;j++){if(arr[j] < arr[j + 1]){swap(arr,j,j+1);
}
}
}
}else{
System.out.println("你输入的方式有误！");
}
}
public void swap(int[] arr,int i ,int j){
int temp = arr[i];
arr[i] = arr[j];
arr[j] = temp;
}

}