Need help with method calling

Question

I have a problem with method calling as it does the method but doesn't send the values to the main program. The Need section in the main should take in the Max and Allocation arrays from the setMax and setAllocation but it doesn't. I figure I'm missing a return call or something. Could you help me out.
    public class Project4
       public static void main (String[] args)
         int[] Available=new int[4];
         int[][]Max=new int[5][4];
         int[][]Allocation=new int[5][4];
         int[][] Need=new int[5][4];
         setMax();
         setAllocated();
         setAvailable();
       //Creates the need.
         int numMax, numAlloc, numNeed;
         for(int row=0; row<5; row++)
            for (int col=0; col<4; col++)
               numMax=Max[row][col];
               numAlloc=Allocation[row][col];
               numNeed=numMax-numAlloc;
               Need[row][col]=numNeed;
         for(int row=0; row<Need.length; row++)
            for (int col=0; col<Need[row].length; col++)
               System.out.print (Need[row][col]);
            System.out.println();
         System.out.println();
        //From here on checks to see if available.     
         int[] processLeft=new int[5];
         int numChecker, numAvail, counter, check, num, stop, processCounter;
         int i=0; 
         num=0;
         stop=3;
         processCounter=0;
         for(int row=num; row<Need.length; row++)
            int col=0;
            counter=Need[row].length; 
            numChecker=Need[row][col];
            numAvail=Available[col];
            do
               check=0;
               numChecker= Need[row][col];
               numAvail=Available[col];
               col++;
               if (numChecker<=numAvail)
                  check=1;
               while(numChecker<=numAvail && col<counter);
            if(col==counter && check==1)
               System.out.println("Process P"+row+" executes");
               for(col=0; col<Allocation.length-1; col++)
                  numChecker=Allocation[row][col];
                  numAvail=Available[col];
                  numAvail=numChecker+numAvail;
                  Available[col]=numAvail;
               num++; 
               processCounter=processCounter+1;
            else
               processLeft=row;
i++;
// Checks the processes left over
int j=0;
int row=0;
int col=0;
counter=Need[row].length;
while(processLeft[j]!=5 && processCounter!=5)
row=processLeft[j];
do
check=0;
numChecker= Need[row][col];
numAvail=Available[col];
col++;
if (numChecker<=numAvail)
check=1;
while(numChecker<=numAvail && col<counter);
if(col==counter && check==1)
System.out.println("Process P"+row+" executes");
for(col=0; col<Allocation.length-1; col++)
numChecker=Allocation[row][col];
numAvail=Available[col];
numAvail=numChecker+numAvail;
Available[col]=numAvail;
processCounter=processCounter+1;
j++;
safe(processCounter);
public static void setAllocated()
     // Creates the Allocation
int[][] Allocation= {{3,0,0,2},{1,0,0,0},{1,3,5,4},{0,6,3,2},{0,0,1,4}};
for(int row=0; row<Allocation.length; row++)
for (int col=0; col<Allocation[row].length; col++)
System.out.print (Allocation[row][col]);
System.out.println();
System.out.println();
public static void setMax()
     // Creates the max
int[][] Max= {{3,0,1,2},{1,5,5,0},{2,3,5,6},{0,6,5,2},{0,6,5,6}};
for(int row=0; row<Max.length; row++)
for (int col=0; col<Max[row].length; col++)
System.out.print (Max[row][col]);
System.out.println();
System.out.println();
public static void setAvailable()
// Creates the Available.
int[] Available={3,5,2,0};
public static void safe(int processCounter)
     // Prints if it is safe or not     
if(processCounter!=5)
System.out.println("\n The system is not safe");     
else
System.out.println("\n The system is safe");

Answer 1

those methods declare and initialize variables that exist only within that specific method, so no other method can see them
move the 4 arrays you declare in main() out of the method into the class body, then in the other methods, don't declare new arrays, simply initialize the ones you just moved into the class body
or alternatively, you could make the methods return the arrays they create, and instead of your main method creating arrays, it simply works with whatever those methods return
btw 20 minutes is a bit early to be getting impatient