public class prisonManager3
{
public static void main(String[]args)
{
System.out.println(" ");
System.out.println("WELCOME TO PRISON MANAGER");
System.out.println(" ");

//create array of prisoners
prisoner [] inmate = new prisoner[3];


System.out.println("Enter details for each inmate.");

for(int i=0;i<inmate.length;i++)
{
inmate[i] = new prisoner();

//enter inmate details
inmate[i].setName();
inmate[i].setAge();
inmate[i].setSentence();
inmate[i].setNumber();
inmate[i].setCellnum(i);

System.out.println("Inmate Recorded");
}


int maxAge = 0, minAge = 999, maxSentence = 0, sentenceCount = 0, youngestCount = 0;

//check for other details

for(int i=0;i<inmate.length;i++)
{
if(inmate[i].age > maxAge)
{
maxAge = inmate[i].age;
}

if(inmate[i].age < minAge)
{
minAge = inmate[i].age;
youngestCount = inmate[i].pnum;
}


if(inmate[i].sentence > maxSentence)
{
maxSentence = inmate[i].sentence;
sentenceCount = inmate[i].cellNum;
}
}


for(int i=0;i<inmate.length;i++)
{
System.out.println(" ");
System.out.println("#" + inmate[i].getNumber());
System.out.println("Name: " + inmate[i].getSurname() + ", " + inmate[i].getForename());
System.out.println("Age: " + inmate[i].getAge());
System.out.println("Sentence: " + inmate[i].getSentence() + " years");
System.out.println(" ");
}

//print other details
System.out.println("The eldest inmate is " + maxAge + " years old.");
System.out.println("#" + youngestCount + " is the youngest inmate.");
System.out.println("Cell #" + sentenceCount + " is serving the longest sentence.");

int yearsCount = 0;

System.out.println(" ");
System.out.println(" ");

for(int j=0;j<inmate.length;j++)
{
sentenceCount = inmate[j].sentence / 2;

for(int i=0;i<100;i++)
{
inmate[j].age += 1;
inmate[j].sentence -= 1;

if(inmate[j].age == 70 || inmate[j].sentence == sentenceCount)
{
i = 100;
System.out.println("#" + inmate[j].pnum + " will be released after " + yearsCount + " years.");
}
else
{
yearsCount += 1;
}
}
}

System.out.println(" ");
System.out.println(" ");
System.out.println("!PROGRAM END!");
System.exit(0);
}
}
[/b]

Separate class:

[b]
class prisoner
{
String forename, surname;
int age, sentence, pnum=47, cellNum;



public void setName()
{
forename=getit.forename();
surname=getit.surname();
}

public String getForename()
{
return forename;
}

public String getSurname()
{
return surname;
}




public void setAge()
{
age=getit.age();
}

public int getAge()
{
return age;
}




public void setSentence()
{
sentence=getit.sentence();
}

public int getSentence()
{
return sentence;
}




public void setNumber()
{
double num;
num=Math.random();
num=num * 100;
num = Math.round(num);
pnum = (int)num;
}

public int getNumber()
{
return pnum;
}




public void setCellnum(int i)
{
cellNum=i + 1;
}

}

for(int i = 0; i<array.length-1; i++)
{
   for(int j = 0; j<array.length-1; j++)
   {
      if(array[j]>array[j+1])
      {
        int temp = array[j]; // int of course could be replaced with anything including your prisoner class
        array[j] = array[j+1];
        array[j+1] = temp;
      }
   }
}