error when i use switch-case

[amrmb09]

Hi, i have written the following code and i got tons of errors, dont know why...please any guidance

import java.lang.*;

public class TestSwitch
{
	public static Double[] test(int i)// i should be from 1 to 4
	{
		Double []prob = new Double[4];
		double x,y,z,x2,y2,z2;
		
		Random rand = new Random();
		
		switch(i)
		{
			case 1: 
			        prob[i-1] = 25.0 + (rand.nextDouble(75) + 1);
			        
			         x = 100 - prob[i-1];			        
			         y = x/3;	
			         z =  y * 2;
			        prob[1]= y + rand.nextDouble(z);

	                 x2 = x-prob[1];
	                 y2 = x2/2;
	                prob[2] = y2 + rand.nextDouble(y2);
	                
	                prob[3] = 100 - ( prob[i-1] + prob[1] + prob[2] );
	                
	                break;
	               
	        case 2: 
			        prob[0] = 25 + rand.nextDouble(75) + 1;
			        
			         x = 100 - prob[0];			        
			         y = x/3;	
			         z =  y * 2;
			        prob[i-1] = y + rand.nextDouble(z);

	                 x2 = x-prob[i-1];
	                 y2 = x2/2;
	                prob[2] = y2 + rand.nextDouble(y2);
	                
	                prob[3] = 100 - ( prob[0] + prob[i-1] + prob[2] );
	                
	                break;
	                
	        case 3: 
			        prob[0] = 25 + rand.nextDouble(75) + 1;
			        
			         x = 100 - prob[0];			        
			         y = x/3;	
			         z =  y * 2;
			        prob[1]= y + rand.nextDouble(z);

	                 x2 = x-prob[1];
	                 y2 = x2/2;
	                prob[i-1] = y2 + rand.nextDouble(y2);
	                
	                prob[3] = 100 - ( prob[0] + prob[1] + prob[i-1] );
	                
	                break;        
	             
	        case 4: 
			        prob[0] = 25 + rand.nextDouble(75) + 1;
			        
			         x = 100 - prob[0];			        
			         y = x/3;	
			         z =  y * 2;
			        prob[1]= y + rand.nextDouble(z);

	                 x2 = x-prob[1];
	                 y2 = x2/2;
	                prob[2] = y2 + rand.nextDouble(y2);
	                
	                prob[i-1] = 100 - ( prob[0] + prob[1] + prob[2] );
	                
	                break;
		}
			  return prob;      
}

	public static void main (String[] args)
	{
		Double []t = TestSwitch.test(4);
		System.out.println (t[1]);
	}
}

and here are the error messages:

--------------------Configuration: <Default>--------------------
D:\3rd semster\Java\ProjectTest\TestSwitch.java:10: cannot find symbol
symbol  : class Random
location: class TestSwitch
        Random rand = new Random();
        ^
D:\3rd semster\Java\ProjectTest\TestSwitch.java:10: cannot find symbol
symbol  : class Random
location: class TestSwitch
        Random rand = new Random();
                          ^
D:\3rd semster\Java\ProjectTest\TestSwitch.java:15: operator + cannot be applied to Random.nextDouble,int
                    prob[i-1] = 25.0 + (rand.nextDouble(75) + 1);
                                                       ^
D:\3rd semster\Java\ProjectTest\TestSwitch.java:15: operator + cannot be applied to double,<nulltype>
                    prob[i-1] = 25.0 + (rand.nextDouble(75) + 1);
                                ^
D:\3rd semster\Java\ProjectTest\TestSwitch.java:20: operator + cannot be applied to double,Random.nextDouble
                    prob[1]= y + rand.nextDouble(z);
                             ^
D:\3rd semster\Java\ProjectTest\TestSwitch.java:24: operator + cannot be applied to double,Random.nextDouble
                    prob[2] = y2 + rand.nextDouble(y2);
                              ^
D:\3rd semster\Java\ProjectTest\TestSwitch.java:31: operator + cannot be applied to int,Random.nextDouble
                    prob[0] = 25 + rand.nextDouble(75) + 1;
                              ^
D:\3rd semster\Java\ProjectTest\TestSwitch.java:31: operator + cannot be applied to <nulltype>,int
                    prob[0] = 25 + rand.nextDouble(75) + 1;
                                 ^
D:\3rd semster\Java\ProjectTest\TestSwitch.java:36: operator + cannot be applied to double,Random.nextDouble
                    prob[i-1] = y + rand.nextDouble(z);
                                ^
D:\3rd semster\Java\ProjectTest\TestSwitch.java:40: operator + cannot be applied to double,Random.nextDouble
                    prob[2] = y2 + rand.nextDouble(y2);
                              ^
D:\3rd semster\Java\ProjectTest\TestSwitch.java:47: operator + cannot be applied to int,Random.nextDouble
                    prob[0] = 25 + rand.nextDouble(75) + 1;
                              ^
D:\3rd semster\Java\ProjectTest\TestSwitch.java:47: operator + cannot be applied to <nulltype>,int
                    prob[0] = 25 + rand.nextDouble(75) + 1;
                                 ^
D:\3rd semster\Java\ProjectTest\TestSwitch.java:52: operator + cannot be applied to double,Random.nextDouble
                    prob[1]= y + rand.nextDouble(z);
                             ^
D:\3rd semster\Java\ProjectTest\TestSwitch.java:56: operator + cannot be applied to double,Random.nextDouble
                    prob[i-1] = y2 + rand.nextDouble(y2);
                                ^
D:\3rd semster\Java\ProjectTest\TestSwitch.java:63: operator + cannot be applied to int,Random.nextDouble
                    prob[0] = 25 + rand.nextDouble(75) + 1;
                              ^
D:\3rd semster\Java\ProjectTest\TestSwitch.java:63: operator + cannot be applied to <nulltype>,int
                    prob[0] = 25 + rand.nextDouble(75) + 1;
                                 ^
D:\3rd semster\Java\ProjectTest\TestSwitch.java:68: operator + cannot be applied to double,Random.nextDouble
                    prob[1]= y + rand.nextDouble(z);
                             ^
D:\3rd semster\Java\ProjectTest\TestSwitch.java:72: operator + cannot be applied to double,Random.nextDouble
                    prob[2] = y2 + rand.nextDouble(y2);
                              ^
18 errors

Process completed.

[pbrockway2]

D:\3rd semster\Java\ProjectTest\TestSwitch.java:10: cannot find symbol
symbol  : class Random
location: class TestSwitch
        Random rand = new Random();

The compiler cannot find the Random class, because you have not imported it. (Incidentally there is no need to import java.lang.*)

Frankly the other errors are reported in a rather mysterious way, but the bottom line is that you cannot meaningfully say "rand.nextDouble(75)". Read the nextDouble() API docs to see how this method should be used.