2010年HDU复试笔试真题（Java）

试题一

import java.util.Random;
import java.util.Scanner;
public class Main{
	public static void main(String[] args) {
		Scanner in=new Scanner(System.in);
		Random rand=new Random();
		int num=rand.nextInt(900)+100;//三位随机数
		int k=10;
		System.out.println("猜数字");
		while(k-->0) {
			int n=in.nextInt();
			if(num==n) {
				System.out.println("恭喜你，猜对了");
				break;
			}
			else {
				if(num>n)
					System.out.println("猜小了，请继续");
				else
					System.out.println("猜大了，请继续");
	
			}
		}
		if(k<=0)
			System.out.println("Bye Bye");
	}
}

考点直击：随机数Random的应用
int num=rand.nextInt(900)+100;//三位随机数

import java.util.Scanner;
public class Main{
	public static void main(String[] args) {
		Scanner in=new Scanner(System.in);
		String str=in.nextLine();
		int len=str.length();
		int num=0;
		int start=0,end=0;
		for(int i=0;i<len;) {
			if(str.charAt(i)<='9'&&str.charAt(i)>='0') {
				start=i;
				end=i;
				for(int j=i+1;j<len;j++) {
					if(str.charAt(j)<='9'&&str.charAt(j)>='0') {
						end=j;
					}
					else
						break;	
				}
				String tmp=str.substring(start, end+1);
				int temp=Integer.parseInt(tmp);
				num+=temp;
				i=end+1;
			}	
			else
				i++;
		}
		System.out.println(num);
	}
}

试题三

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.Arrays;
import java.util.Comparator;
import java.util.Scanner;
public class Main{
	static int k;
	public static void main(String[] args) throws IOException{
		Scanner in=new Scanner(System.in);
		String path="C:\\Users\\Administrator\\Desktop";
		File fr=new File(path,"student.txt");
		BufferedReader br=new BufferedReader(new FileReader(fr));
		String temp;
		temp=br.readLine();
		Student stu[]=new Student[100];把100改成3即可（假设有3个人）
		temp=br.readLine();
		k=0;
		while(temp!=null) {
			String tmp[]=temp.split("\\t");
			stu[k++]=new Student(tmp[0],tmp[1],tmp[2],tmp[3],tmp[4],tmp[5]);
			temp=br.readLine();
		}
		Arrays.sort(stu, new Comparator<Student>() {
				@Override
				public int compare(Student o1,Student o2) {
					if(o1.score<o2.score)
						return 1;
					else
						return -1;
				}
			});
			for(int i=0;i<k;i++) {
				int j=i+1;
				System.out.println(stu[i].name+" "+stu[i].score+" "+j);
			}
	}
}
class Student{
	String name,sno;
	int english_score,police_score,math_score,major_score,score;
	public Student(String name,String sno,String english_score,String police_score,String math_score,String major_score) {
		this.name=name;
		this.sno=sno;
		this.english_score=Integer.parseInt(english_score);
		this.police_score=Integer.parseInt(police_score);
		this.math_score=Integer.parseInt(math_score);
		this.major_score=Integer.parseInt(major_score);
	}
}