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Java 创建自定义堆栈以保存整数

欢马劈雪

工程师 (已认证)

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创建自定义堆栈以保存整数

实例源码：

源代码：

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public class StackOfInts {

private int[] stack;

//index of last item in the stack + 1//来自 时 代 J a v a 公 众 号 - N o w J a v  a . c o m

private int next = 0;

public StackOfInts(int size) {

//create an array large enough to hold the stack

stack = new int[size];

}

public void push(int on) {

//push an integer onto the stack

if (next < stack.length) {

stack[next++] = on;

}

}
//来 自 N o w J a v a . c o m

public boolean isEmpty() {

//check if the stack is empty

return (next == 0);

}

public int pop() {

//pop an integer from the stack

if (!isEmpty()) {

// next item in the stack

return stack[--next];

} else {

return 0;

}

public int getStackSize() {

//get the size of the stack

return next;

}

//class that steps through the stack

//not related to the stack functionality.

private class StepThrough {

// start stepping through the stack at i=0 with step 2

private int i = 0;

// retrieve the current element

public int getNext() {

//get a next value in the stack

int retValue = stack[i];

if (i < stack.length) {

i = i + 2;

}

return retValue;

}

//last element in the stack?

public boolean hasNext() {

return (i < getStackSize());

}

//utility method for creating a new StepThrough class instance

public StepThrough stepThrough() {

return new StepThrough();

}

public static void main(String[] args) {

//instantiate the outer class as "stackOne"

StackOfInts stackOne = new StackOfInts(15);

//populate the stackOne

System.out.print("Pushing elements into the stack: ");

for (int j = 0; j < 15; j++) {

System.out.print("" + j + " ");

stackOne.push(j);

}

System.out.println();

System.out

.println("Iterating through the whole stack selecting only even indexes:");

//instantiate the inner class as "iterator"

StepThrough iterator = stackOne.stepThrough();

//print out the stackOne[i]

while (iterator.hasNext()) {

System.out.print(iterator.getNext() + " ");

}

System.out.println();

System.out.println("Popping all elements from the stack:");

for (int j = 0; j < 15; j++) {

System.out.print(stackOne.pop() + " ");

}

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* modification, are permitted provided that the following conditions

* are met:

*   - Redistributions of source code must retain the above copyright

*     notice, this list of conditions and the following disclaimer.

*   - Redistributions in binary form must reproduce the above copyright

*     notice, this list of conditions and the following disclaimer in the

*     documentation and/or other materials provided with the distribution.

*   - Neither the name of Oracle or the names of its

*     contributors may be used to endorse or promote products derived

*     from this software without specific prior written permission.

* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS

* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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编辑于 2020-03-26 09:23:272020-03-26 09:23:27

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