import java.io.*;
import java.util.*;
class Test{
public static void main(String args[]){
Stack stack = new Stack();
// push
for( int i = 0 ; i < 5 ; i++ ){
Integer integer = new Integer(i);
stack.push(integer);
System.out.println( "push : " + integer );
}
// 改行
System.out.println();
// pop
while( !stack.empty() )
System.out.println( "pop : " + stack.pop() );
}
}
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