Java学习笔记之数组

一些java数组的基本使用方法

package cn.itcast.day05.demo01;

public class Demo01 {
    public static void main(String[] args) {
        System.out.println();
        int [] array = new int[100];
        array[0] = 1;
        System.out.println(array[0]);
    }
}

package cn.itcast.day05.demo01;
//直接打印数组名称,得到的是数组对应得内存地址哈希值
public class Demo02Array {
    public static void main(String[] args) {
        int array3[] = new int [5] ;
        int array4[] = {1,2,3};
        int [] array5 = {1,2,3,4,5};
        System.out.println(array3[2]);
    }
}

package cn.itcast.day05.demo01;

public class Demo03_Array_reserve {
    public static void main(String[] args) {
        int arrayA[] = new int [5];
        for(int i=0;i<5;i++){
            arrayA[i] = i;
        }
        for (int i = 0; i < arrayA.length; i++) {
            System.out.println(arrayA[i]);
        }
        System.out.println("=======================");
        int min = 0;
        int max = arrayA.length-1;
        while(min!=max){
            int temp = arrayA[min];
            arrayA[min] = arrayA[max];
            arrayA[max] = temp;
            min++;
            max--;
        }
        for (int i = 0; i < 5; i++) {
            System.out.println(arrayA[i]);
        }

    }


}

package Demo04;
/*数组作为方法的参数,在进行方法调用的时候,传递进去的是数组的地址值*/
public class Demo01ArrayParam {
    public static void main(String[] args) {
        int[] array = {1,2,3,4,5,6};
        printArray(array);

    }
    public static void printArray(int[] array){
        for (int i = 0; i < 6; i++) {
            System.out.println(array[i]);
        }
    }
}

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