華南理工大學(xué)大一JAVA復(fù)習(xí)題

1、2.1從輸入對話框讀入double型的華氏度，將其轉(zhuǎn)換為攝氏度，并在消息對話框中顯示結(jié)果。Celsius = (5/9)*(Fahrenheit-32)import javax.swing.JOptionPane;public class Exercise2_1 public static void main(String args) String fahrenheitString = JOptionPane.showInputDialog(null, Enter a temperature in fahrenheit:, Exercise2_1 Input, JOptionPane.QUES

2、TION_MESSAGE); double fahrenheit = Double.parseDouble(fahrenheitString); double celsius = (5.0 / 9.0) * (fahrenheit - 32); System.out.println(The temperature is + celsius + in Celsius); System.exit(0); 2.7編寫程序?qū)⒋髮懽帜皋D(zhuǎn)換為小寫字母，該字符在源代碼ASCII中指定為直接量。public class Exercise2_7 public static void main(String ar

3、gs) char uppercase = F; int offset = (int)a - (int)A; char lowercase = (char)(int)uppercase + offset); System.out.print(The lowercase letter is + lowercase); 3.1 （三角形有效性驗(yàn)證）讀入三角形的三條邊并確定輸入是否有效。如果任意兩條邊和大于第三邊則輸入有效。import javax.swing.JOptionPane;public class Exercise3_1 public static void main(String arg

4、s) String numberString = JOptionPane.showInputDialog(null, Enter the first edge length (double), Exercise3_1 Input, JOptionPane.QUESTION_MESSAGE); double edge1 = Double.parseDouble(numberString); numberString = JOptionPane.showInputDialog(null, Enter the second edge length (double), Exercise3_1 Inpu

5、t, JOptionPane.QUESTION_MESSAGE); / Convert string to double double edge2 = Double.parseDouble(numberString); numberString = JOptionPane.showInputDialog(null, Enter the third edge length (double), Exercise3_1 Input, JOptionPane.QUESTION_MESSAGE); double edge3 = Double.parseDouble(numberString); Syst

6、em.out.println(Can edges + edge1 + , + edge2 + , and + edge3 + form a triangle? + ( (edge1 + edge2 edge3) & (edge1 + edge3 edge2) & (edge2 + edge3 edge1); System.exit(0); 4.1 （千克轉(zhuǎn)換成磅）編一個顯示下列表格的程序（1千克為2.2磅）(1kilogram = 2.2 pounds)KilogramsPounds12.236.6197433.4199437.8public class Exercise3_8 public

7、static void main(String args) System.out.println(kilogramsttpounds); System.out.println(-); int kilograms = 1; for (int i = 1; i = 100; kilograms += 2, i+) System.out.println(kilograms + tt + kilograms * 2.2); 4.18 用嵌套的循環(huán)語句，分別編寫程序打印下列圖案。Pattern 111 21 2 31 2 3 41 2 3 4 51 2 3 4 5 6Pattern 21 2 3 4 5

8、 61 2 3 4 51 2 3 41 2 31 2 /* Print Pattern I */public class Exercise3_23 public static void main(String args) for (int i = 1; i = 6; i+) for (int j = 1; j = i; j+) System.out.print(j + ); System.out.println(); /pattern 2public class test public static void main(String args) for (int i = 1; i = 6; i

9、+) for (int j = 1; j = A & c num2) double temp = num1; num1 = num2; num2 = temp; if (num2 num3) double temp = num2; num2 = num3; num3 = temp; if (num1 num2) double temp = num1; num1 = num2; num2 = temp; System.out.println(The sorted numbers are + num1 + + num2 + + num3); 6.1讀入10個數(shù)字，計算它們的平均值并且找出有多少個數(shù)

10、字在平均值之上。import javax.swing.*;public class Exercise5_1 public static void main(String args) double numbers = new double10; double sum = 0; for (int i = 0; i numbers.length; i+) String s = JOptionPane.showInputDialog(Enter a number: ); numbersi = Double.parseDouble(s); sum += numbersi; double average

11、= sum / 10; int countGreater = 0; for (int i = 0; i average) countGreater+; System.out.println(The number of values greater than the average is + countGreater); System.exit(0); 6.5讀入10個數(shù)并且顯示其中相互不同的數(shù)。提示：讀入一個數(shù)，如果它是新數(shù)，則把它存儲在數(shù)組中；如果數(shù)組中已有該數(shù)，則把它丟棄。輸入結(jié)束后，數(shù)組中的數(shù)都是不同的數(shù)。public class Exercise6_5 public static vo

12、id main(String args) int numbers = new int10; int size = 0; for (int i = 0; i numbers.length; i+) String s = JOptionPane.showInputDialog(null, Enter an integer); int value = Integer.parseInt(s); boolean isInArray = false; for (int j = 0; j (Circle1)o).getRadius() return 1; else if (getRadius() (Cyli

13、nder1)o).findVolume() return 1; else if (findVolume() 0) return o1; else return o2; 10.編寫一個方法，返回對象組中最大的對象。（查找最大的對象）import java.util.Date;public class Exercise10_9 static int i; public Exercise10_9() public static void main(String args) String strings = CS, Math, Biol, Chem, Phys, Buss, Law, Educ, El

14、ec Engr, Mech Engr; Integer list = new Integer10; Date dates = new Date10; for (int i = 0; i list.length; i+) listi = new Integer(int)(Math.random() * 100); for (int i = 0; i list.length; i+) datesi = new Date(); System.out.println(Max string is + max(strings); System.out.println(Max integer is + ma

15、x(list); System.out.println(Max circle is + max(dates); public static Object max(Object a) Comparable max = (Comparable)a0; for (int i = 1; i a.length; i+) if (pareTo(ai) 0) max = (Comparable)ai; return max; 11.1編寫程序，利用Rational類計算下述級數(shù)的和：/ Exercise11_1.java: Use the Rational classpublic class Exercis

16、e11_1 public static void main(String args) final int N = 100; Rational sum = new Rational(); for (int i = 1; i = N; i+) sum = sum.add(new Rational(i - 1, i); System.out.println(The sum of the first series is + sum + = + sum.doubleValue(); 17.1編寫一個程序，利用異常處理方法處理非數(shù)值操作數(shù)，然后在編寫一個程序，不適用異常處理方法達(dá)到同樣的目的。程序推出前應(yīng)

17、該顯示一條信息，通知用戶發(fā)生了操作數(shù)類型錯誤。/ Exercise17_1.java: Using（ NumberFormatException異常）public class Exercise17_1 public static void main (String args) int num1, num2, result = 0; if (args.length != 3) System.out.println( please use java operand1 operator operand2); System.exit(0); try num1 = Integer.parseInt(args0); catch (NumberFormatException ex) System.out.println(Wrong Input: + args0