java_二维数组简单快递系统

利用二维数组存储快递信息

通过二维数组存储快递信息，利用一个临时数组操作，取件码通过Random函数自动生成

快递员存快递

快递员查看所有快递

快递员修改快递

快递员删除快递

用户取快递

代码如下：

public class Demo1 {

	public static void main(String[] args) {
		String express[][] = new String[0][3]; //定义快递二维数组
		String[][] arr; // 定义临时数组
		while (true) {
			System.out.println("==欢迎使用XXX快递柜===");
			System.out.println("请输入你的身份：1-快递员，2-用户");
			Scanner s = new Scanner(System.in);
			int i = s.nextInt();
			if (i == 1) {
				System.out.println("请选择操作：1-存快递 2-删除快递 3-修改快递信息 4-查看所有快递");
				int j = s.nextInt();
				switch (j) {
				
				
				// 1-存快递
				case 1:
					System.out.println("请输入快递单号：");
					String num = s.next();
					System.out.println("请输入公司名称：");
					String name = s.next();
					Random ran = new Random();
					String r = Integer.toString(ran.nextInt(1000));
					System.out.println("快递已存入，取件码是：" + r);

					arr = new String[express.length + 1][3];
					for (int n = 0; n < express.length; n++) {
						System.arraycopy(express, 0, arr, 0, express.length);
					}
					arr[arr.length - 1] = new String[] { num, name, r };
					express = arr;
					break;
					
					
				// 2-删除快递
				case 2:
					arr = new String[express.length - 1][3];
					System.out.println("请输入要删除的快递单号：");
					String l = s.next();
					for (int n = 0; n < express.length; n++) {
						if (express[n][0].equals(l)) {
							System.arraycopy(express, 0, arr, 0, n);
							System.arraycopy(express, n + 1, arr, n, arr.length - n);
							express = arr;
							System.out.println("删除成功");
							break;
						} else if (n == express.length - 1) {
							System.out.println("未找到快递");
							break;
						}
						
					}
					break;
				
					
				//3-修改快递信息
				case 3:
					System.out.println("请输入要修改的快递单号：");
					String o = s.next();
					for (int n = 0; n < express.length; n++) {
						if (express[n][0].equals(o)) {
							System.out.println("请输入新的快递单号：");
							String newnum = s.next();
							express[n][0] = newnum;
							System.out.println("请输入新的快递公司：");
							String newname = s.next();
							express[n][1] = newname;
							System.out.println("修改成功");
						} else if (i == express.length - 1) {
							System.out.println("未找到快递");
							break;
						}						
					}
					break;
					
				// 	4-查看所有快递
				case 4:
					System.out.println("----------------全部快递---------------");
					System.out.println("快递号\t\t快递公司\t\t取件码");
					for (int n = 0; n < express.length; n++) {
						for (int m = 0; m < express[n].length; m++) {
							System.out.print(express[n][m] + "\t\t");
						}
						System.out.println();
					}
					break;
				default:
					System.out.println("输入有误！");
				}
				// 用户取件部分
			} else if (i == 2) {
				arr = new String[express.length - 1][3];
				System.out.println("请输入取件码：");
				String p = s.next();
				for (int n = 0; n < express.length; n++) {
					if (express[n][2].equals(p)) {
						System.arraycopy(express, 0, arr, 0, n);
						System.arraycopy(express, n + 1, arr, n, arr.length - n);
						express = arr;
						System.out.println("取件成功");
						break;
					} else if (n == express.length - 1) {
						System.out.println("未找到快递");
						break;
					}
					
				}
				
			} else {
				System.out.println("输入有误！");
			}
		}
	}

}