public class ArrayUtils{
//1.计算数组中最大值
public static int arrayMaxElement(int[] data){
int max = data[0];
for(int i=0; i<data.length; i++){
if(data[i] > max){
max = data[i];
}
}
return max;
}
//2.计算数组中最小值
public static int arrayMinElement(int[] data){
int min = data[0];
for(int i=0; i<data.length; i++){
if(data[i] < min){
min = data[i];
}
}
return min;
}
//3.计算数组值之和
public static int arrayElementSum(int[] data){
int sum = 0;
for(int i=0; i<data.length; i++){
sum += data[i];
}
return sum;
}
//4.数组拼接
public static int[] arrayJoin(int[] a, int[] b){
int[] c = new int[a.length+b.length];
for(int i=0; i<a.length; i++){
c[i]=a[i];
}
for(int i=a.length; i<c.length; i++){
c[i]=b[i-a.length];
}
return c;
}
//5.数组截取
//[start, end)
public static int[] arraySub(int[] data, int start , int end){
for(int i=start; i<end; i++){
System.out.print(data[i]+" ");
}
System.out.print("\n");
return null;
}
//6.数组打印
public static void printArray(int[] data){
for(int i=0; i<data.length; i++){
System.out.print(data[i]+" ");
}
System.out.print("\n");
}
//7.数组反转
// 比如:[1,2,3,4] => [4,3,2,1]
public static void printReversal(int[] data){
int temp = 0;
int left = 0;
int right = data.length-1;
while(left<right){
temp = data[left];
data[left] = data[right];
data[right] = temp;
left++;
right--;
}
printArray(data);
}
public static void main(String[] args){
int[] data = new int[]{1,4,9,10};
int[] data1 = new int[]{11,12,13,14};
//最大值
System.out.println(arrayMaxElement(data));
//最小值
System.out.println(arrayMinElement(data));
//和
System.out.println(arrayElementSum(data));
//数组拼接
printArray(arrayJoin(data,data1));
System.out.print("\n");
//数据截取
arraySub(data,1,3);
//打印数组
printArray(data);
//数组反转
printReversal(data);
}
}
【Java】ArrayUtils的实现
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转载自blog.csdn.net/wxj_enchanted/article/details/84069434
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