java小题

标签：

1、通过键盘输入一个整数n，编程计算1+2+3+...+n的值。

2、通过键盘输入任意6个整数，输出最大数和最小数。

3、编写程序计算12-22+32-42+...+972-982+992-1002的值。

</pre><pre name="code" class="java">1、import java.util.Scanner;
public class test1 {
	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		int n,i,sum=0;
		n=sc.nextInt();
		for(i=1;i<=n;i++)
			sum+=i;
        System.out.println(sum);
	}

}

import java.util.Arrays;
import java.util.Scanner;
public class test2 {
	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		int a[]=new int[6];
		int i;
		for(i=0;i<6;i++)
		a[i]=sc.nextInt();
		Arrays.sort(a);
		System.out.println(a[0]);
		System.out.println(a[5]);
        
	}

}

public class test3 {
	public static void main(String[] args) {
	int i=12,j=22,n,sum=0;
	for(n=1;n<=98;n++)
	{
		sum+=i-j;
		i+=10;
		j+=10;
	}
   System.out.println(sum);
	}

}

class student{
	int id;
	int age;
	String last_name;
	String first_name;
	void initstudent(String l,String f){
		last_name=l;
		first_name=f;
	}
	String get(){
		return first_name+last_name;
	}
}
public class test4 {
	public static void main(String[] args) {
		student s=new student();
    s.initstudent("lin","yu");
    System.out.println(s.get());
	}

}

class Cylinder{
	double r;
	double height;
	void initCylinder(double l,double h){
		r=l;
		height=h;
	}
	double getArea(){
		return Math.PI*r*r;
	}
	double getVolume(){
		return Math.PI*r*r*height;
	}
}
public class test5 {
	public static void main(String[] args) {
		Cylinder c=new Cylinder();
		c.initCylinder(8.6, 5.5);
		System.out.println(c.getArea());
		System.out.println(c.getVolume());

	}

}

class Person{
	int id;
	String name;
	String sleep(){
		return "睡觉时流56口水";
	}
	String eat(){
		return "宝宝吃牛奶";
	}
}
public class test6 {
	public static void main(String[] args) {
		Person p=new Person();
		System.out.println(p.eat());
		System.out.println(p.sleep());

	}

}

java小题

标签：

原文地址：http://blog.csdn.net/qq_24928451/article/details/45216827