JAVA测试题 一、 环境要求：Eclipse3.2 JDK1.5及以上...

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import java.util.Arrays;

import java.util.Scanner;

public class Test {

public static void main(String[] args) {

System.out.print("Please input a digit number: ");

Scanner scanner = new Scanner(System.in);

int digit = scanner.nextInt();

switch(digit){

case 1:

int sum = method1();

System.out.println("Sum is: " + sum);

break;

case 2:

System.out.println("最大数字和最小差异为: " + metho2(6));

break;

case 3:

System.out.print("Please input r:");

double r = scanner.nextDouble();

System.out.println("Area is: " + method3(r));

break;

case 4:

method4();

break;

default:

System.out.println("Invalid input, progream exit!");

}

}

private static void method4() {

System.out.print("Please input your name:");

String str = new Scanner(System.in).nextLine();

String familyName = str.substring(0, 1);

String givenName = str.substring(1);

System.out.println("姓氏:" + familyName);

System.out.println("名字:" + givenName);

}

private static double method3(double r) {

return Math.PI * r * r;

}

private static int metho2(int size) {

int[] ary = new int[size];

Scanner scanner = new Scanner(System.in);

for(int i = 0; i < ary.length; i++){

System.out.print("Please input a number");

ary[i] = scanner.nextInt();

}

Arrays.sort(ary);

int max = ary[size -1];

int min = ary[0];

return max - min;

}

private static int method1() {

System.out.print("Please input the number: ");

int value = new Scanner(System.in).nextInt();

int sum = 0;

for(int i = 0; i <= value; i+=3){

sum += i;

}

return sum;

}

}