Is there better way?

Question

Hi! To check which input for the population is lower I used double min and double max. But while loop for counting years is not working. What is better way to do it?
I'd appreciate any help you can give.
Thanks.
Program asks for data on two species and has to respond by telling how many years it will
take for the species with lower
population outnumber the species that starts with higher population.
class SpeciesTry
private String name1;
private String name2;
private int population1;
private int population2;
private double growthRate1;
private double growthRate2;
public void readInput( )
System.out.println("What is the first species' name?");
name1 = SavitchIn.readLine( );
System.out.println("What is the population of the species?");
population1 = SavitchIn.readLineInt( );
while (population1 < 0)
System.out.println("Population cannot be negative.");
System.out.println("Reenter population:");
population1 = SavitchIn.readLineInt( );
System.out.println("Enter growth rate (percent increase per year):");
growthRate1 = SavitchIn.readLineDouble( );
System.out.println("What is the second species' name?");
     name2 = SavitchIn.readLine( );
     System.out.println("What is the population of the species?");
     population2 = SavitchIn.readLineInt( );
     while (population2 < 0)
     System.out.println("Population cannot be negative.");
     System.out.println("Reenter population:");
     population2 = SavitchIn.readLineInt( );
     System.out.println("Enter growth rate (percent increase per year):");
growthRate2 = SavitchIn.readLineDouble( );
public void writeOutput( )
System.out.println("Name of the species' = " + name1);
          System.out.println("Population = " + population1);
          System.out.println("Growth rate = " + growthRate1 + "%");
          System.out.println("Name of the species' = " + name2);
          System.out.println("Population = " + population2);
System.out.println("Growth rate = " + growthRate2 + "%");
public void outnumbersPopulation()
double max=0; double min=0; double minGrowthRate=0; double maxGrowthRate=0;
String maxName=null; String minName=null;
int years=0;
if ((population1<=population2)&(growthRate1<=growthRate2))
System.out.println("The species " + name1 + " will never outnumber the species " + name2 );
System.exit(0);
else if ((population2<=population1)&(growthRate2<=growthRate1))
System.out.println("The species " + name2 + " will never outnumber the species " + name1 );
System.exit(0);
if((population1>population2)&(growthRate1<growthRate2))// this is to determine which population is smaller
max=population1;
maxName=name1;
maxGrowthRate=growthRate2;
min=population2;
minGrowthRate=growthRate1;
minName=name2;
if ((population2>population1) &(growthRate2<growthRate1))
max=population2;
maxName=name2;
maxGrowthRate=growthRate1;
min=population1;
minName=name1;
minGrowthRate=growthRate2;
while ( (min <=max) & (years > 0) )
min= (min +((minGrowthRate/100) * min));
max=(max + ((maxGrowthRate/100) * max));
years ++;
System.out.println("The species " + minName + " will outnumber the species " + maxName +
" in " + (years+1) + " years");
public class Species
     public static void main(String[] args)
     SpeciesTry s1= new SpeciesTry();
     s1.readInput();
     s1.writeOutput();
     s1.outnumbersPopulation();
}

Answer 1

I'm new to Java and posting. So, here's my program again with outnumberPopulation() method formated. Is there any hope for this program?
class SpeciesTry
private String name1;
private String name2;
private int population1;
private int population2;
private double growthRate1;
private double growthRate2;
public void readInput( )
System.out.println("What is the first species' name?");
name1 = SavitchIn.readLine( );
System.out.println("What is the population of the species?");
population1 = SavitchIn.readLineInt( );
while (population1 < 0)
System.out.println("Population cannot be negative.");
System.out.println("Reenter population:");
population1 = SavitchIn.readLineInt( );
System.out.println("Enter growth rate (percent increase per year):");
growthRate1 = SavitchIn.readLineDouble( );
System.out.println("What is the second species' name?");
     name2 = SavitchIn.readLine( );
     System.out.println("What is the population of the species?");
     population2 = SavitchIn.readLineInt( );
     while (population2 < 0)
     System.out.println("Population cannot be negative.");
     System.out.println("Reenter population:");
     population2 = SavitchIn.readLineInt( );
     System.out.println("Enter growth rate (percent increase per year):");
growthRate2 = SavitchIn.readLineDouble( );
public void writeOutput( )
System.out.println("Name of the species' = " + name1);
          System.out.println("Population = " + population1);
          System.out.println("Growth rate = " + growthRate1 + "%");
          System.out.println("Name of the species' = " + name2);
          System.out.println("Population = " + population2);
System.out.println("Growth rate = " + growthRate2 + "%");
   public void outnumbersPopulation()
        double max=0;  double min=0; double minGrowthRate=0; double maxGrowthRate=0;
        String maxName=null; String minName=null;
                int years=0;
        if( population1>population2)// this is to determine which population is smaller
        {    max=population1;
            maxName=name1;
            maxGrowthRate=growthRate2;
            min=population2;
            minGrowthRate=growthRate1;
            minName=name2;
         else
                max=population2;
                maxName=name2;
                maxGrowthRate=growthRate1;
                min=population1;
                minName=name1;
                minGrowthRate=growthRate2;
       if (minGrowthRate<=maxGrowthRate)
          System.out.println(minName+" will never grow larger than "+maxName);
          return;
         while ( (min <=max) & (years > 0) )
             min= (min +((minGrowthRate/100) * min));
               max=(max + ((maxGrowthRate/100) * max));
                           System.out.println("Check" + max + min);
                           years ++;
        System.out.println("The species " + minName + " will outnumber the species " + maxName +
        " in " + (years+1) + " years");
public class Species
     public static void main(String[] args)
     SpeciesTry s1= new SpeciesTry();
     s1.readInput();
     s1.writeOutput();
     s1.outnumbersPopulation();
}