出题系统（java版）

（1）思路：三个方法，生成一定数量的整数题，生成一定数量的分数题，功能目录。其中，利用一个数组，数组长度为题目数量+1，每次随机生成一道题与数组比较，用来避免题目重复。

（2）代码：

import java.util.Scanner;
public class test {
	public static void main(String[] args) {
		Scanner scanner=new Scanner(System.in);
		int state = 0;
		while(state == 0)
		{
			mulu();
			int num = scanner.nextInt();
			if(num ==1)
			{
				System.out.println("输入题目数量");
				suan(scanner.nextInt());
			}
			if(num ==2)
			{
				System.out.println("输入题目数量");
				zsuan(scanner.nextInt());
			}
			if(num ==3)
			{
				state = 1;
				System.out.println("已退出！！");
			}
		}
	}

	public static void mulu()
	{
		System.out.println("************************");
		System.out.println("1.整数运算");
		System.out.println("2.真分数运算");
		System.out.println("3.退出");
		System.out.println("************************");
		System.out.println("请选择");
	}

	public static void suan(int num) {
		String[] str = new String[num+1];
		str[0]="";
		for(int i=1;i<=num;i++)
		{
			String ss="";
			int state = 0;
			int intVal3 = (int)(Math.random()*4+1);
			int intVal1 = 0;
			int intVal2 = 0;
			while(state == 0)
			{
				intVal1 = (int)(Math.random()*100+1);
				intVal2 = (int)(Math.random()*100+1);

				ss = intVal1+""+intVal2;

				for(int j=0;j<i;j++)
				{
					if(ss.equals(str[i-1]))
						state=0;
					else
					{
						state=1;
						str [i]=intVal1+""+intVal2;
					}
				}
			}

			System.out.print(i+" 、 ");
			if(intVal3==1){
				System.out.print(intVal1);
				System.out.print("  +  ");
				System.out.print(intVal2);
				System.out.print("= ?");
				System.out.println();
			}
			if(intVal3==2){
				System.out.print(intVal1);
				System.out.print("  -  ");
				System.out.print(intVal2);
				System.out.print("= ?");
				System.out.println();
				}
			if(intVal3==3){
				System.out.print(intVal1);
				System.out.print("  *  ");
				System.out.print(intVal2);
				System.out.print("= ?");
				System.out.println();
				}
			if(intVal3==4){
				System.out.print(intVal1);
				System.out.print("  ÷  ");
				System.out.print(intVal2);
				System.out.print("= ?");
				System.out.println();
				}
		}
	}

	public static void zsuan(int num)
	{
		String[] st = new String[num+1];
		st[0]="";
		for(int i=1;i<=num;i++)
		{
			int num1 = 0;
			int num2 = 0;
			int num3 = 0;
			int num4 = 0;

			String ss="";
			String ss1="";
			String ss2="";
			int state = 0;
			int intVal3 = (int)(Math.random()*4+1);
			while(state == 0)
			{

				while(num1==num2)
				{
					num1 = (int)(Math.random()*100+1);num2 = (int)(Math.random()*100+1);

					if(num1<num2)
					{
						ss1=num1+"/"+num2;
					}
					else
					{
						ss1=num2+"/"+num1;
					}
				}

				while(num3==num4)
				{
					num3 = (int)(Math.random()*100+1);num4 = (int)(Math.random()*100+1);
					if(num3<num4)
					{
						ss2=num3+"/"+num4;
					}
					else
					{
						ss2=num4+"/"+num3;
					}
				}

				ss =ss1+ss2;
				for(int j=0;j<i;j++)
				{
					if(ss.equals(st[i-1]))
						state=0;
					else
					{
						state=1;
						st [i]=ss1+ss2;
					}
				}
			}

			System.out.print(i+" 、 ");
			if(intVal3==1){
				System.out.print(ss1);
				System.out.print("  +  ");
				System.out.print(ss2);
				System.out.print("= ?");
				System.out.println();
			}
			if(intVal3==2){
				System.out.print(ss1);
				System.out.print("  -  ");
				System.out.print(ss2);
				System.out.print("= ?");
				System.out.println();
				}
			if(intVal3==3){
				System.out.print(ss1);
				System.out.print("  *  ");
				System.out.print(ss2);
				System.out.print("= ?");
				System.out.println();
				}
			if(intVal3==4){
				System.out.print(ss1);
				System.out.print("  ÷  ");
				System.out.print(ss2);
				System.out.print("= ?");
				System.out.println();
			}
		}
	}
}

　　（3）结果：