数组的使用
普通for循环
For-Each循环
数组作方法入参
数组作返回值
package com.lilili;
public class Demo30_1 {
public static void main(String[] args) {
int[] arrays = {1,2,3,4,5,6,7};
//打印全部的数组元素
for (int i =0;i<arrays.length;i++){
System.out.println(arrays[i]);
}
System.out.println("=============================");
//计算所有元素的和
int sum = 0;
for (int i=0;i<arrays.length;i++){
sum +=arrays[i];
}
System.out.println("和为:"+sum);
System.out.println("=============================");
//查找最大元素
int max = arrays[0];
for(int i=0;i<arrays.length;i++){
if(arrays[i]>max){
max = arrays[i];
}
System.out.println("max为:"+sum);
}
}
}
package com.lilili;
public class Demo30_2 {
public static void main(String[] args) {
int[] arrays = {1,2,3,4,5};
//JDK1.5 ,没有下标
for (int array : arrays) {
System.out.println(array);
}
printArray(arrays);
int[] reverse = reverse(arrays);
printArray(reverse);
}
//打印数组元素
public static void printArray(int[] arrays){
for (int i=0;i<arrays.length;i++){
System.out.println(arrays[i]+" ");
}
}
//反转数组
public static int[] reverse(int[] arrays){
int[] result = new int[arrays.length];
//反转的操作
for (int i = 0,j=result.length-1; i <arrays.length ; i++,j--){
result[j] = arrays[i];
}
return result;
}
}