java語言程式設計基礎篇第九章程式設計練習題
1 import java.util.Scanner; public class Main{ public static void main(String[] args){ Rectangle R1 = new Rectangle(40,4); Rectangle R2 = new Rectangle(35.9,3.5); System.out.println(R1.getArea() + "\n" + R2.getArea()); System.out.println(R1.getPerimeter() + "\n" + R2.getPerimeter()); } } class Rectangle{ double width = 1; double height = 1; Rectangle() { } Rectangle(double h, double w){ height = h; width = w; } double getArea(){ return width*height; } double getPerimeter(){ return 2*(width+height); } } 2 import java.util.Scanner; public class Main { public static void main(String[] args) { Stock obj = new Stock("ORCL","Oracle Corporation"); obj.previousClosingPrice = 34.5; obj.currentPrice = 34.35; System.out.println(obj.getChangePercent()); } } class Stock{ String symbol; String name; double previousClosingPrice = 0.0; double currentPrice = 0.0; public Stock(String sym, String na){ symbol = sym; name = na; } public String getChangePercent(){ return Math.abs(((currentPrice-previousClosingPrice)/previousClosingPrice))*100+"%"; } } 3 import java.util.Scanner; import java.util.Date; public class Main{ public static void main(String[] args){ long num = 10000; Date date = new Date(num); System.out.println(date.toString()); date.setTime(num*10); System.out.println(date.toString()); date.setTime(num*100); System.out.println(date.toString()); date.setTime(num*1000); System.out.println(date.toString()); date.setTime(num*num); System.out.println(date.toString()); date.setTime(num*num*10); System.out.println(date.toString()); date.setTime(num*num*100); System.out.println(date.toString()); date.setTime(num*num*1000); System.out.println(date.toString()); } } 4 import java.util.Scanner; import java.util.Random; public class Main{ public static void main(String[] args){ Random random = new Random(1000); for(int i = 0; i < 50; ++i){ System.out.print(random.nextInt(100) + " "); if(i%10 == 0) System.out.println(); } } } 5 import java.util.Scanner; import java.util.GregorianCalendar; //我很納悶為什麼輸出結果是一樣的 public class Main{ public static void main(String[] args){ GregorianCalendar calendar = new GregorianCalendar(); System.out.println(calendar.YEAR + ":" + calendar.MONTH + ":" + calendar.DAY_OF_MONTH); calendar.setTimeInMillis(1234567898765L); System.out.println(calendar.YEAR + ":" + calendar.MONTH + ":" + calendar.DAY_OF_MONTH); } } 6 import java.util.Scanner; import java.util.Date; import java.util.GregorianCalendar; public class Main{ public static void main(String[] args){ StopWatch time = new StopWatch(); int[] nums = new int[100000]; for(int i = 1; i <= 100000; ++i) nums[i-1] = (int)((System.currentTimeMillis()/i)%1000); time.start(); for(int i = 0; i < 99999; ++i){ for(int j = i+1; j < 100000; ++j){ if(nums[i] > nums[j]){ int temp = nums[i]; nums[i] = nums[j]; nums[j] = temp; } } } time.stop(); System.out.println(time.getElapsedTime()); } } class StopWatch{ private long startTime; private long endTime; public StopWatch(){ startTime = System.currentTimeMillis(); } public void start(){ startTime = System.currentTimeMillis(); } public void stop(){ endTime = System.currentTimeMillis(); } public long getElapsedTime(){ return endTime - startTime; } } 7 import java.util.Scanner; import java.util.Date; public class Main{ public static void main(String[] args){ Account account = new Account(1122,20000); if(account.withDraw(2500)) System.out.println("Success"); else System.out.println("Fail"); if(account.deposit(2500)) System.out.println("Success"); else System.out.println("Fail"); System.out.println("balance:" + account.getBalance()); System.out.println("monthly interest:" + account.getMonthlyInterestRate()*account.getBalance()); System.out.println(account.getDate().toString()); } } class Account{ private int id; private double balance; private double annualInterestRate; private Date dateCreated; public Account(){ dateCreated = new Date(); id = 0; balance = 0; annualInterestRate = 0; } public Account(int ID, double BALANCE){ dateCreated = new Date(); id = ID; balance = BALANCE; annualInterestRate = 0.045; } public int getId(){ return id; } public void setId(int ID){ id = ID; } public double getBalance(){ return balance; } public void setBalance(double ba){ balance = ba; } public double getAnnualInterestRate(){ return annualInterestRate; } public void setAnnualInterestRate(double annual){ annualInterestRate = annual; } public Date getDate(){ return dateCreated; } public double getMonthlyInterestRate(){ return annualInterestRate/12.0; } public boolean withDraw(double money){ if(balance >= money){ balance -= money; return true; } else return false; } public boolean deposit(double money){ if(money >= 0){ balance += money; return true; } else return false; } } 8 import java.util.Scanner; import java.util.Date; public class Main{ public static void main(String[] args){ Fan fan1 = new Fan(); fan1.setSpeed(); fan1.setRadius(10); fan1.setColor("yellow"); fan1.setOn(); Fan fan2 = new Fan(); fan2.setSpeed(); System.out.println(fan1.toString()); System.out.println(fan2.toString()); } } class Fan{ public static final int SLOW = 1; public static final int MEDIUM = 2; public static final int FAST= 3; private int speed; private boolean on; private double radius; private String color; public Fan(){ speed = SLOW; on = false; radius = 5; color = "blue"; } public int getSpeed(){ return speed; } public void setSpeed(){ System.out.println("1.SLOW 2.MEDIUM 3.FAST"); Scanner cin = new Scanner(System.in); int num = cin.nextInt(); speed = num; } public boolean getOn(){ return on; } public void setOn(){ System.out.println("1.on 2.off"); Scanner cin = new Scanner(System.in); int num = cin.nextInt(); if(num == 1) on = true; else on = false; } public double getRadius(){ return radius; } public void setRadius(double r){ radius = r; } public String getColor(){ return color; } public void setColor(String str){ color = str; } public String toString(){ if(on) return "Speed:" + speed + "\nColor:" + color + "\nRadius:" + radius; else return "fan is off"; } } 9 import java.util.Scanner; public class Main{ public static void main(String[] args){ RegularPolygon g1 = new RegularPolygon(); System.out.println("g1 perimeter:" + g1.getPerimeter() + " " + "g1 area:" + g1.getArea()); RegularPolygon g2 = new RegularPolygon(6,4); System.out.println("g2 perimeter:" + g2.getPerimeter() + " " + "g2 area:" + g2.getArea()); RegularPolygon g3 = new RegularPolygon(10,4,5.6,7.8); System.out.println("g3 perimeter:" + g3.getPerimeter() + " " + "g3 area:" + g3.getArea()); } } class RegularPolygon{ private int n; private double side; private double x; private double y; public RegularPolygon(){ n = 3; side = 1; x = 0; y = 0; } public RegularPolygon(int num, double len){ n = num; side = len; x = 0; y = 0; } public RegularPolygon(int num, double len, double a, double b){ n = num; side = len; x = a; y = b; } public int getN(){ return n; } public void setN(int num){ n = num; } public double getSide(){ return side; } public void setSide(double len){ side = len; } public double getX(){ return x; } public void setX(double X){ x = X; } public double getY(){ return y; } public void setY(double Y){ y = Y; } public double getPerimeter(){ return n*side; } public double getArea(){ return (n*side*side)/(4*Math.tan(Math.PI/n)); } }
10 import java.util.Scanner; public class Main{ public static void main(String[] args){ QuadraticEquation expr = new QuadraticEquation(1,4,4); if(expr.getRoot1() == 0 && expr.getRoot2() == 0){ System.out.println("The equation has no roots"); } else if(expr.getRoot1() == expr.getRoot2()) System.out.println("R : " + expr.getRoot1()); else System.out.println("R1 : " + expr.getRoot1() + " " + "R2 :" + expr.getRoot2()); } } class QuadraticEquation{ private double a,b,c; QuadraticEquation(double x, double y, double z){ a = x; b = y; c = z; } public double getA(){ return a; } public double getB(){ return b; } public double getC(){ return c; } public double getDiscriminant(){ return b*b - 4*a*c; } public double getRoot1(){ double judge = this.getDiscriminant(); if(judge >= 0){ return (-b + Math.sqrt(judge))/(2*a); } else return 0; } public double getRoot2(){ double judge = this.getDiscriminant(); if(judge >= 0){ return (-b + Math.sqrt(judge))/(2*a); } else return 0; } } 11 import java.util.Scanner; public class Main{ public static void main(String[] args){ LinearEquation expr1 = new LinearEquation(9.0,4.0,3.0,-5.0,-6.0,-21.0); LinearEquation expr2 = new LinearEquation(1.0,2.0,2.0,4.0,4.0,5.0); if(expr1.isSolvable()){ System.out.println("x:" + expr1.getX() + " " + "y:" + expr1.getY()); } else System.out.println("The equation has no solution"); if(expr2.isSolvable()){ System.out.println("x:" + expr2.getX() + " " + "y:" + expr2.getY()); } else System.out.println("The equation has no solution"); } } class LinearEquation{ private double a,b,c,d,e,f; public LinearEquation(double v1, double v2, double v3, double v4, double v5, double v6){ a = v1; b = v2; c = v3; d = v4; e = v5; f = v6; } public double getA(){ return a; } public double getB(){ return b; } public double getC(){ return c; } public double getD(){ return d; } public double getE(){ return e; } public double getF(){ return f; } public boolean isSolvable(){ if((a*d-b*c) != 0) return true; else return false; } public double getX(){ return (e*d-b*f)/(a*d-b*c); } public double getY(){ return (a*f-e*c)/(a*d-b*c); } } 12 import java.util.Scanner; public class Main{ public static void main(String[] args){ Scanner cin = new Scanner(System.in); double x1,y1,x2,y2,x3,y3,x4,y4; System.out.print("Enter x1,y1,x2,y2,x3,y3,x4,y4:"); x1 = cin.nextDouble(); y1 = cin.nextDouble(); x2 = cin.nextDouble(); y2 = cin.nextDouble(); x3 = cin.nextDouble(); y3 = cin.nextDouble(); x4 = cin.nextDouble(); y4 = cin.nextDouble(); double a,b,c,d,e,f; a = y1 - y2; b = -(x1 - x2); c = y3 - y4; d = -(x3 - x4); e = (y1-y2)*x1 - (x1-x2)*y1; f = (y3-y4)*x3 - (x3-x4)*y3; LinearEquation expr = new LinearEquation(a,b,c,d,e,f); if(expr.isSolvable()){ System.out.println("x:" + expr.getX() + " " + "y:" + expr.getY()); } else System.out.println("The tow line are parallel"); } } class LinearEquation{ private double a,b,c,d,e,f; public LinearEquation(double v1, double v2, double v3, double v4, double v5, double v6){ a = v1; b = v2; c = v3; d = v4; e = v5; f = v6; } public double getA(){ return a; } public double getB(){ return b; } public double getC(){ return c; } public double getD(){ return d; } public double getE(){ return e; } public double getF(){ return f; } public boolean isSolvable(){ if((a*d-b*c) != 0) return true; else return false; } public double getX(){ return (e*d-b*f)/(a*d-b*c); } public double getY(){ return (a*f-e*c)/(a*d-b*c); } } 13 import java.util.Scanner; public class Main{ public static void main(String[] args){ double[][] nums = new double[3][4]; Scanner cin = new Scanner(System.in); for(int i = 0; i < 3; ++i){ for(int j = 0; j < 4; ++j){ nums[i][j] = cin.nextDouble(); } } Location location = locateLargest(nums); System.out.println(location.maxValue + "--" + location.row + "," + location.column); } public static Location locateLargest(double[][] a){ int x = 0,y = 0; double max = 0; for(int i = 0; i < a.length; ++i){ for(int j = 0; j < a[i].length; ++j){ if(a[i][j] > max){ max = a[i][j]; x = i; y = j; } } } Location temp = new Location(); temp.row = x; temp.column = y; temp.maxValue = max; return temp; } } class Location{ public int row,column; public double maxValue; }
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