这是来自接口的方法,我必须在另一个类中实现,但我不知道如何创建它。我必须使用带有 printStream 参数的linkedList 打印堆栈。在类节点(用于linkedList)中,我有一个方法getObject()。
import java.io.PrintStream;
import java.util.NoSuchElementException;
public interface StringStack {
public boolean isEmpty();
public void push(String item);
public String pop() throws NoSuchElementException;
public String peek() throws NoSuchElementException;
/**
* print the contents of the stack, starting from the item
* on the top,
* to the stream given as argument. For example,
* to print to the standard output you need to pass System.out as
* an argument. E.g.,
* printStack(System.out);
*/
public void printStack(PrintStream stream);
public int size();
}
public class StringStackImpl implements StringStack {
private Node head;
....
public void printStack(PrintStream stream) {???}
}