计算机等级考试2级 Java-大题题库集

1、格式化DecimalFormat pre = new DecimalFormat( );JTextField output;output.setText(pre.format(result);Applet雪小程序查看器二Java_l.class-Ini xlApplet欢迎你来参加翻a语言考试!小程序已启动。import java.applet.*import java.awt.Graphics;public class Java_l extendsApplet public void paint(Graphics g) g.drawString(欢迎您”,25,25);)此题的嘤求是：在Ap

2、p】e中显小。至10的阶乘,请完善Jav、2.jza文件.并进行调试（“命令打中使用applet viewer Java.2,htmb或者使用集成开发环境）.但运行结果为：Applet2 6 2 172 6 2 17import java.awt.*;import jave.applet.*;public class Java_2 extendsApplet( 一Text Area outputArea;public void init()setLayout(new BorderLayout();outputArea = new TextArea();add(outputArea);for(l

3、ong i = 0; i 8002int a,x = 2008; while(x!=0) a = x % 10;x = x / 10;)矩阵乘法public class Java_2 public static void main(String args) int a = 2, 3, 4, 4, 6, 5);int b = 1, 5, 2, 8, 5, 9,10, -3, 2, 7, -5, -18;t t/ /不不不不不不不不不J XX | |不不不不不不不不不不int c = new int24;for (int i = 0; i I I C Z不不不可不不不不不不for (int j =

4、 0; j I I C Z不不不可不不不不不不for (int k = 0; k 3; k+)f fB/不不不不不不不不不,11rz*i不不不不不不不不不不cij +=aik*bkj;System.out.print(cij + );)System.out.println();)题3import java.io.*;public class Java_l( public static void main(String args) throws ExceptionInputStreamReader ir = new InputSteamReader(System.in);BufferedRead

5、er in = new BufferedReader(ir);String s = in.readLine();int year = Integer.parselnt(s);if(year%4=0 & year%100!=0 | | year%400=0)System. out. println(year+”是闰年“)；elseSystem, out. println(year+“不是闰 年”)题4自定义排序public class Java_2 public static void main(String args) Student java = new Student3;java0 = n

6、ew Student(李明”,80);javal = new Student。赵冬) 75);java2 = new Student。王晓、98);I /*f o u n d *Arrays.sort(java);System.out.println(Java成绩降序排序的结果是：)； for (int i = 0; i java.length; i+)Student e = javai;/ / *F 0*System.out.println(,name= + e.getName()+:fenshu=+ e.getFenshu();)I / * * * * f o u * class Stud

7、ent implements Comparable public Student(String n, double f) name = n;fenshu = f;)public String getName() return name;)public double getFenshu() return fenshu;)public int compareTo(Object otherObject)Student other = (Student)otherObject; if (fenshu other.fenshu) return -1; return 0;)private String name;I / *F 0*private double fenshu;)悭序的劝奥是：提示用户输入大于Q的隹数n,利用近似公式计U自然数”的近恨值:e=H(l 1!)(1)+”n!), 并打印出该近蚁值例如输入10时.输出结果为e的近似值为，public static void main(String args) int n;double e = 1.0;(请输入 n:);/* *pounc(* * *Scanner scan = new Scanner (System.in);String nstr = scan.next();/* *pounc|*