How can be restrict a class for making its limited objects?.

Here's some code to limit the number of instances that can be created for a particular class. The limit has been set to 10 in this example but can be anything you want:

import java.io.*;

class A

{

int a;

public int getField()

{

return a;

}

static final int limit = 10;

static int count = 0;

public static int getCount()

{

return count;

}

public static A Create(int a)

{

if (count < limit)

{

A instance = new A(a);

count++;

return instance;

}

else

{

System.out.println("There are already " + limit + " instances of A in existence");

return null;

}

private A(int a)

{

this.a = a;

}

class Test

{

public static void main(String[] args)

{

A[] aa = new A[11];

for(int i = 0; i < 11; i++)

{

aa[i] = A.Create(i); // try to create 11 A objects

}

System.out.println(A.getCount()); // 10

}

1 Reply

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Vulpes14y ago
Here's some code to limit the number of instances that can be created for a particular class. The limit has been set to 10 in this example but can be anything you want:

import java.io.*;

class A
{
int a;

public int getField()
{
return a;
}

static final int limit = 10;
static int count = 0;

public static int getCount()
{
return count;
}

public static A Create(int a)
{
if (count < limit)
{
A instance = new A(a);
count++;
return instance;
}
else
{
System.out.println("There are already " + limit + " instances of A in existence");
return null;
}
}

private A(int a)
{
this.a = a;
}
}

class Test
{
public static void main(String[] args)
{
A[] aa = new A[11];

for(int i = 0; i < 11; i++)
{
aa[i] = A.Create(i); // try to create 11 A objects
}

System.out.println(A.getCount()); // 10
}
}
0