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// This class implements a "fail-soft" array which prevents runtime errors.

public class FailSoftArray {

private int a[]; // reference to array

private int errval; // value to return if get() fails.

public int length; // length is public

// Construct array given its size and the value to return if get() fails.

public FailSoftArray(int size, int errv) {

a = new int[size];

errval = errv;

length = size;

}

// Return value at given index.

public int get(int index) {

if (indexOK(index))

return a[index]; // Trap on out-of-bounds index.

return errval;

}

// Put a value at an index. Return false on failure.

public boolean put(int index, int val) {

if (indexOK(index)) { // Trap on out-of-bounds index.

a[index] = val;

return true;

}

return false;

}

// Return true if index is within bounds.

private boolean indexOK(int index) {

if (index >= 0 & index < length)

return true;

return false;

}

}