Cleartrip.com Interview Question for Software Developers


Country: India
Interview Type: Written Test




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public class SizedStack {
public static void main(String[] args) {
Stack test = new Stack(5);
try {
test.push(new NodeX("a"));
test.push(new NodeX("b"));
test.push(new NodeX("c"));
test.push(new NodeX("d"));
test.push(new NodeX("e"));
test.push(new NodeX("f"));
} catch (StackFullException e) {
System.out.println("overflow");
}
}
}

class Stack {
NodeX top;
int size;

Stack(int size) {
this.size = size;
}

NodeX pop() {
NodeX out = top;
top = top.next;
out.next = null;
return out;
}

void push(NodeX in) throws StackFullException {
int realSize = 0;
NodeX bottom = null;
while (top != null) {
realSize++;
if (bottom == null) {
bottom = top;
top = top.next;
bottom.next = null;
} else {
NodeX currentBottom = bottom;
bottom = top;
top = top.next;
bottom.next = currentBottom;
}
}
if (realSize < size) {
while (bottom != null) {
NodeX currentTop = top;
top = bottom;
bottom = bottom.next;
top.next = currentTop;
}
System.out.println(top);
in.next = top;
top = in;
} else {
throw new StackFullException();
}
}
}

class NodeX {
String name;
NodeX next;

NodeX(String name) {
this.name = name;
}

@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append(this.name);
if (this.next != null) {
sb.append(this.next.toString());
}
return sb.toString();
}
}

class StackFullException extends Exception {
StackFullException() {
super();
}

StackFullException(String message) {
super(message);
}

StackFullException(String message, Throwable cause) {
super(message, cause);
}

StackFullException(Throwable cause) {
super(cause);
}
}

- Mei Li February 12, 2017 | Flag Reply


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