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Copy pathstackusingarray.java
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74 lines (64 loc) · 1.32 KB
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public class stackusingarray {
public int[] arr;
public int top;
// ublic stackusingarray()
// {
//
// this.size(default_Capacity);
// }
public stackusingarray(int capacity) throws Exception
{
arr= new int[capacity];
this.top=-1;
if(capacity<1)
{
throw new Exception("invalid input size");
}
}
public int size()
{
return top+1;
}
public boolean isempty()
{
return this.size()==0;
}
public void push(int value) throws Exception
{
if(this.size()==this. arr.length)
{
throw new Exception("array is full");
}
this. top++;
this. arr[this.top]=value;
}
public int pop()throws Exception
{
if(this.size()==0)
{
throw new Exception("array is empty");
}
int rv=arr[top];
arr[top]=0;
top--;
return rv;
}
public int top()throws Exception
{
if(this.size()==0)
{
throw new Exception("array is empty");
}
int rv=arr[top];
return rv;
}
public void display()
{
int i;
for(i = this.top; i>=0; i--)
{
System.out.print(arr[i]+" ");
}
System.out.println("end ");
}
}