JAVA-array use

JAVA-array use

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• For-Each loop
• Array as method input
• Array as return value

public class Demo3 {
    
    
    public static void main(String[] args) {
    
    
        //定义并输出数组
        int[] arrays={
    
    1,2,3,4,5};
        for (int i = 0; i <arrays.length ; i++) {
    
    
            System.out.println(arrays[i]);
        }
        System.out.println("==========================");
        //求数组的和
        int sum=0;
        for (int i = 0; i <arrays.length ; i++) {
    
    
            sum+=arrays[i];
        }
        System.out.println("sum="+sum);
        System.out.println("==========================");
        //查找数组中最大对的数
        int max=arrays[0];
        for (int i = 0; i <arrays.length ; i++) {
    
    
            if (arrays[i]>max){
    
    
                max=arrays[i];
            }
        }System.out.println("数组最大值："+max);
    }
        
        
}

Advanced array

---

public class Demo4 {
    
    
    public static void main(String[] args) {
    
    
        int[] arrays ={
    
    1,2,3,4,5};
//        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];
        for (int i = 0,j= result.length-1;i <arrays.length ; i++,j--) {
    
    
            result[j]=arrays[i];
        }
        return result;
    }

}