编码GBK的不可映射字符

背景：在eclipse中可以正常运行，eclipse的编码是UTF-8；在CMD中通过javac运行则显示错误：编码GBK的不可映射字符。

解决方法：
1、保证CMD的编码是936，即chcp 936。
chcp 936是GBK, chcp 65001是UTF-8。
2、保证Java文件的编码是UTF-8。

3、在CMD中执行javac的命令改为javac -encoding utf-8 -d . 文件名.java
比如我的就是javac -encoding utf-8 -d . Main.java

附上源码供测试，有不当的地方请指正=-=！

import java.util.Arrays;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		System.out.println(
				"1、两个乒乓球队进行比赛，各出三人。甲队为a,b,c三人，乙队为x,y,z三人。已抽签决定比赛名单。有人向队员打听比赛的名单。a说他不和x比，c说他不和x,z比，请编程序找出三队赛手的名单");
		System.out.println("2、一个5位数，判断它是不是回文数。即12321是回文数，个位与万位相同，十位与千位相同 ");
		System.out.println("3、有五个学生，每个学生有3门课的成绩，从键盘输入以上数据（包括学生号，姓名，三门课成绩），计算出平均成绩");
		System.out.println("4、将一个数组逆序输出");
		System.out.println("5、有一个已经排好序的数组。现输入一个数，要求按原来的规律将它插入数组中");
		System.out.println("6、打印出杨辉三角形(要求打印出10行)");
		System.out.println("7、输入数组，最大的与第一个元素交换，最小的与最后一个元素交换，输出数组");
		System.out.println("8、字符串数组排序");
		System.out.println("9、有n个人围成一圈，顺序排号。从第一个人开始报数（从1到3报数），凡报到3的人退出圈子，问最后留下的是原来第几号的那位");
		System.out.println("0、退出");
		System.out.println("请输入要演示的题目序号: ");
		Scanner sc = new Scanner(System.in);
		String pa = "\\d{1}";
		String str = sc.next();

		if (str.matches(pa)) {
			int num = Integer.parseInt(str);
			switch (num) {
			case 1:
				pingpang();
				break;
			case 2:
				Number_of_tracts();
				break;
			case 3:
				Average_Score();
				break;
			case 4:
				Array_reverse_order();
				break;
			case 5:
				Insert_number();
				break;
			case 6:
				Triangle();
				break;
			case 7:
				Exchange();
				break;
			case 8:
				sorts();
				break;
			case 9:
				people();
				break;
			case 0:
				break;
			default:
				break;
			}
		} else {
			System.out.println("您的输入不合法,=-=!");
		}
	}

	public static void pingpang() {
		char i, j, k;
		System.out.println("三队选手的名单为: ");
		for (i = 'X'; i <= 'Z'; i++) {
			for (j = 'X'; j <= 'Z'; j++) {
				if (i != j) {
					for (k = 'X'; k < 'Z'; k++) {
						if (i != k && j != k) {
							if (i != 'X' && k != 'X' && k != 'Z')
								System.out.printf("a -- %c\nb -- %c\nc -- %c", i, j, k);
						}
					}
				}
			}
		}
	}

	public static void Number_of_tracts() {
		Scanner sc = new Scanner(System.in);
		String str = "\\d{5}";
		System.out.println("请输入一个五位数: ");
		String num = sc.next();
		if (num.matches(str)) {
			int number = Integer.parseInt(num);
			int a = number % 10;
			int b = number / 10 % 10;
			int c = number / 1000 % 10;
			int d = number / 10000;
			if (a == d && b == c) {
				System.out.println(number + "是回文数!");
			} else {
				System.out.println(number + "不是回文数！");
			}
		} else {
			System.out.println("您的输入不符合题目要求，=-=！");
		}
	}

	public static void Average_Score() {
		Student[] stu = new Student[] { new Student("小三", "1001", 0, 0, 0), new Student("小四", "1002", 0, 0, 0),
				new Student("小五", "1003", 0, 0, 0), new Student("小六", "1004", 0, 0, 0),
				new Student("小七", "1005", 0, 0, 0) };
		Scanner sc = new Scanner(System.in);
		for (int i = 0; i < stu.length; i++) {
			System.out.println("请输入第" + (i + 1) + "个学生的成绩: ");
			String pa = "(\\d{2})(\\.\\d+)|100?";
			String str1 = sc.next();
			String str2 = sc.next();
			String str3 = sc.next();
			if (str1.matches(pa) && str2.matches(pa) && str3.matches(pa)) {
				double a = Integer.parseInt(str1);
				double b = Integer.parseInt(str2);
				double c = Integer.parseInt(str3);
				stu[i].yuwen = a;
				stu[i].shuxue = b;
				stu[i].yingyu = c;

				double avg = (stu[i].yuwen + stu[i].shuxue + stu[i].yingyu) / 3;
				System.out.println(stu[i].name + "的平均成绩是: " + avg);
			} else {
				System.out.println("您的输入不符合题目要求，=-=！");
				return;
			}

		}
	}

	public static class Student {
		private String name;
		private String number;
		private double yuwen;
		private double shuxue;
		private double yingyu;

		public String getName() {
			return name;
		}

		public void setName(String name) {
			this.name = name;
		}

		public String getNumber() {
			return number;
		}

		public void setNumber(String number) {
			this.number = number;
		}

		public double getYuwen() {
			return yuwen;
		}

		public void setYuwen(double yuwen) {
			this.yuwen = yuwen;
		}

		public double getShuxue() {
			return shuxue;
		}

		public void setShuxue(double shuxue) {
			this.shuxue = shuxue;
		}

		public double getYingyu() {
			return yingyu;
		}

		public void setYingyu(double yingyu) {
			this.yingyu = yingyu;
		}

		@Override
		public String toString() {
			return "Student [name=" + name + ", number=" + number + ", yuwen=" + yuwen + ", shuxue=" + shuxue
					+ ", yingyu=" + yingyu + "]";
		}

		public Student(String name, String number, double yuwen, double shuxue, double yingyu) {
			super();
			this.name = name;
			this.number = number;
			this.yuwen = yuwen;
			this.shuxue = shuxue;
			this.yingyu = yingyu;
		}
	}

	public static void Array_reverse_order() {
		Scanner sc = new Scanner(System.in);
		System.out.println("请输入数组长度： ");
		String pa= "[1-9]+";
		String string= sc.next();
		if(string.matches(pa)) {
			int a= Integer.parseInt(string);
			System.out.println("请输入一组整数: ");
//			List<Integer> list = new ArrayList<>();
			int[] n= new int[a];
			for(int i= 0; i< n.length; i++) {
				String ss= sc.next();
				if(ss.matches(pa)) {
					int aa= Integer.parseInt(ss);
					n[i]= aa;
				}else {
					System.out.println("您的输入不合法，=-=！");
					return ;
				}				
			}
			System.out.print("您输入的数为: [");
			for (int i = 0; i < n.length; i++) {
				System.out.print(n[i] + ((i == n.length - 1) ? "]" : ","));
			}
			System.out.print("\n逆序为: [");
			for (int j = n.length - 1; j >= 0; j--) {
				System.out.print(n[j] + ((j == 0) ? "]" : ","));
			}
		}else {
			System.out.println("您的输入不合法,=-=!");
			return ;
		}
	}

	public static void Insert_number() {
		int[] a = { 60, 50, 40, 30, 20, 10 };
		System.out.println("该数组为: ");
		System.out.print("[");
		for (int i = 0; i < a.length; i++) {
			System.out.print(a[i] + ((i == a.length - 1) ? "]" : ","));
		}
		System.out.println("\n请向该数组中插入一个数字: ");
		Scanner sc = new Scanner(System.in);
		String pa = "-?\\d*\\.?\\d+";
		String string = sc.next();
		if (string.matches(pa)) {
			int num = Integer.parseInt(string);
			a = Arrays.copyOf(a, a.length + 1);
			a[a.length - 1] = num;
			if (a[0] < a[a.length - 2]) { 
				Arrays.sort(a);
				System.out.println("插入一个数字后的数组为: ");
				System.out.print("[");
				for (int i = 0; i < a.length; i++) {
					System.out.print(a[i] + ((i == a.length - 1) ? "]" : ","));
				}
			} else {
				Arrays.sort(a);
				System.out.println("插入一个数字后的数组为: ");
				System.out.print("[");
				for (int i = a.length - 1; i >= 0; i--) {
					System.out.print(a[i] + ((i == 0) ? "]" : ","));
				}
			}
		}else {
			System.out.println("您所插入不合法，=-=！");
			return ;
		}
	}

	public static void Triangle() {
		System.out.println("10行的杨辉三角，拿走不谢~");
		int i, j;
		int[][] num = new int[10][10];
		for (i = 0; i < 10; i++) {
			num[i][0] = 1;
			num[i][i] = 1;
		}

		for (i = 2; i < 10; i++) {
			for (j = 1; j < i; j++) {
				num[i][j] = num[i - 1][j - 1] + num[i - 1][j];
			}
		}

		for (i = 0; i < 10; i++) {
			for (int k = 0; k < 4 * (10 - i) / 2; k++) 
				System.out.printf(" ");

			for (j = 0; j <= i; j++) {
				System.out.printf("%4d", num[i][j]);
			}
			System.out.println();
		}
	}

	public static void Exchange() {
		int N = 8;
		int[] a = new int[N];
		Scanner s = new Scanner(System.in);
		int idx1 = 0, idx2 = 0;
		String pa= "\\d+";
		System.out.println("请输入8个整数：");
		for (int i = 0; i < N; i++) {
			String string= s.next();
			if(string.matches(pa)) {
				int ss= Integer.parseInt(string);
				a[i] = ss;
			}else {
				System.out.println("您的输入不合法，=-=！");
				return ;
			}			
		}
		System.out.println("你输入的数组为：");
		for (int i = 0; i < N; i++) {
			System.out.print(a[i] + " ");
		}
		int max = a[0], min = a[0];
		for (int i = 0; i < N; i++) {
			if (a[i] > max) {
				max = a[i];
				idx1 = i;
			}
			if (a[i] < min) {
				min = a[i];
				idx2 = i;
			}
		}
		if (idx1 != 0) {
			int temp = a[0];
			a[0] = a[idx1];
			a[idx1] = temp;
		}
		if (idx2 != N - 1) {
			int temp = a[N - 1];
			a[N - 1] = a[idx2];
			a[idx2] = temp;
		}
		System.out.println("\n交换后的数组为：");
		for (int i = 0; i < N; i++) {
			System.out.print(a[i] + " ");
		}
	}

	public static void sorts() {
		Scanner sc = new Scanner(System.in);
		System.out.println("请输入8组字符串： ");
		String[] strings = new String[8];
		String pa= "[A-Za-z0-9]+";
		for (int i = 0; i < 8; i++) {
			String string= sc.next();
			if(string.matches(pa)) {
				strings[i] = string;
			}else {
				System.out.println("您的输入不合法，=-=！");
				return ;
			}			
		}
		System.out.print("您输入的字符串数组为: [");
		for (int i = 0; i < strings.length; i++) {
			System.out.print(strings[i] + ((i == strings.length - 1) ? "]" : ","));
		}
		Arrays.sort(strings);
		System.out.print("\n排序后的字符串数组为: [");
		for (int i = 0; i < strings.length; i++) {
			System.out.print(strings[i] + ((i == strings.length - 1) ? "]" : ","));
		}
	}

	public static void people() {
		Scanner in = new Scanner(System.in);
		System.out.println("请输入总人数: ");
		String paString= "[1-9]*";
		String nums = in.next();
		if(nums.matches(paString)) {
			int num= Integer.parseInt(nums);
			boolean[] man = new boolean[num];

			for (int i = 0; i < man.length; i++) {
				man[i] = true;
			}

			int t = 0, len = man.length;
			while (len > 1) {
				for (int i = 0; i < man.length; i++) {
					if (man[i]) {
						t++;
						if (t == 3) {
							t = 0; 
							man[i] = false; 
							len--; 
						}
					}
				}
			}

			System.out.println("最后的情况：" + Arrays.toString(man));
			for (int i = 0; i < man.length; i++) {
				if (man[i]) 
				{
					System.out.println("原来剩下的数：" + (i + 1)); 
				}
			}
		}else {
			System.out.println("您的输入不合法，=-=！");
		}		
	}
}