stkint.java

《深入浅出设计模式》的完整源代码

package interpreter;

public class StkInt {
  private int[] arr = new int[ 9 ];
  private int sp = -1;
  void push (int ch) {
    if (!isFull ())
      arr[ ++sp ] = ch;
  }

  int pop () {
    if (isEmpty ())
      return 0;
    return arr[ sp-- ];
  }

  boolean isFull () {
    return sp == arr.length - 1;
  }

  boolean isEmpty () {
    return sp == -1;
  }

}