java面试题之编程【火星车问题】

骑猪看日落 2022-10-01 03:51 57阅读 0赞

/\*\*  
 \*author：Kevin  
 \*date:2011-07-17  
 \*function:The problem of Mars car.

\*China firmly opposes Obama-Dalai meeting  
 \*The WAR is actually begun!Now you are the Commander of the Fleet.  
 \*You  can input command to control the Mars Car to go straight,  
 \*turn left,turn right,and the car maybe your loyal soldier.  
 \*The command input like this string:LL1LRR89L2,  
 \*and at last  report the location of the car to Commander.  
 \*L means turn left,R means turn right,number0-9 means how far the car can go  
 \*request:1).ExtremeProgramming 2).Pair Programming 3).Test Driven Development  
 \*/

import java.io.BufferedReader;  
import java.io.InputStreamReader;  
import java.util.Scanner;

public class TestMarsCar \{

public static void main(String\[\] args) throws Exception \{

BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));  
  System.out  
    .println("Now,the Mars car is loarding on the Mars,input the loaction");  
  System.out.println("input x:(number)");  
  String x = bf.readLine();  
  System.out.println("input y:(number)");  
  String y = bf.readLine();  
  System.out.println("input direction:(N,W,S,E)");  
  String f = bf.readLine();  
  System.out.println("the car is loaded in (" + x + "," + y + "," + f  
    + ")");  
  // create Marscar object  
  Marscar car = new Marscar(x, y, f);

while (true) \{  
   System.out.println("\\n\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*"  
     + "\\npress 1or 2 to select \*" + "\\n1:new command         \*"  
     + "\\n2:exit                \*"  
     + "\\n\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\\ninput number:");  
   Scanner s1 = new Scanner(System.in);  
   int ints1 = Integer.parseInt(s1.next());  
   if (ints1 == 1) \{  
    System.out.println("input new command like (L,R,0-9):");

Scanner s = new Scanner(System.in);  
    String commands = s.next();  
    for (int i = 0; i < commands.length(); i++) \{  
     String command = String.valueOf(commands.charAt(i));

if (command.equals("L")) \{  
      car.turnLeft(car.getF());  
     \} else if (command.equals("R")) \{  
      car.goRight(car.getF());  
     \} else \{  
      int n = Integer.parseInt(command);  
      car.goAhead(n);  
     \}  
     // show the location of mars car.  
     System.out.println("the new location is (" + car.getX()  
       + "," + car.getY() + "," + car.getF() + ")");

\}  
   \} else if (ints1 == 2) \{  
    System.exit(0);  
   \} else \{  
    System.out.println("YOu command is Wrong!");  
   \}  
  \}  
 \}  
\}

// -----------------------------------------  
// class Marscar  
class Marscar \{  
 private String x; // x-coordinate  
 private String y; // Y-coordinate  
 private String f; // direction

public String getX() \{  
  return x;  
 \}

public void setX(String x) \{  
  this.x = x;  
 \}

public String getY() \{  
  return y;  
 \}

public void setY(String y) \{  
  this.y = y;  
 \}

public String getF() \{  
  return f;  
 \}

public void setF(String f) \{  
  this.f = f;  
 \}

// constructor  
 public Marscar(String x, String y, String f) \{  
  this.x = x;  
  this.y = y;  
  this.f = f;  
 \}

public void turnLeft(String f) \{  
  System.out.println("go left");  
  if (f.equals("N")) \{  
   setF("W");  
  \} else if (f.equals("E")) \{  
   setF("N");  
  \} else if (f.equals("S")) \{  
   setF("E");  
  \} else if (f.equals("W")) \{  
   setF("S");  
  \}  
 \}

public void goRight(String f) \{  
  System.out.println("go right");  
  if (f.equals("N")) \{  
   setF("E");  
  \} else if (f.equals("E")) \{  
   setF("S");  
  \} else if (f.equals("S")) \{  
   setF("W");  
  \} else if (f.equals("W")) \{  
   setF("N");  
  \}  
 \}

// input number to control how far the car go ahead  
 public void goAhead(int n) \{  
  int intx = Integer.parseInt(x);  
  int inty = Integer.parseInt(y);  
  if (this.getF().equals("N")) \{  
   intx += n;  
  \} else if (this.getF().equals("E")) \{  
   inty += n;  
  \} else if (this.getF().equals("S")) \{  
   intx -= n;  
  \} else if (this.getF().equals("W")) \{  
   inty -= n;  
  \}  
  this.x = String.valueOf(intx);  
  this.y = String.valueOf(inty);  
 \}  
\}