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刚看了书 纯手敲一个检验下

public class FixedCapacityStackOfStrings {

private String[] a;

private N;

public FixedCapacityStackOfStrings(int capacity)

{ a=new String[capacity]}

public boolean isEmpty()

{ return N==0}

public int size()

{ return N}

public void push(Strings)

{ a[N++]=s;}

publish String pop()

{ return a[--N]}