centos下修改ssh端口

堆栈，都懂得。先进后出。直接看代码吧，实现以下功能：
创建堆栈
压入值

弹出值

查看栈顶值

压入一组值

public class TheStack {

private String [] stackArray;

private int stackSize;

private int topOfStack = -1;

TheStack(int size){
stackSize = size;
stackArray = new String[size];
Arrays.fill(stackArray, "-1");
}

public void printStack(){

StringBuffer sb = new StringBuffer("-");
for (int i = 0; i<stackSize; i++){
sb.append("-----");
}

String septalLine= sb.toString();

System.out.println(septalLine);
for (int i = 0; i<stackSize; i++){
System.out.print("|  " + i + " ");
}
System.out.println("|");
System.out.println(septalLine);
for (int i = 0; i<stackSize; i++){
if(stackArray[i].equals("-1"))
System.out.print("|    ");
else
System.out.print("| " + stackArray[i] + " ");
}
System.out.println("|");
System.out.println(septalLine);
}

public void push(String input){
if(topOfStack+1<stackSize){
topOfStack++;
stackArray[topOfStack] = input;
} else System.out.println("The stack is full");
}

public String pop(){
if (topOfStack>=0){
stackArray[topOfStack]="-1";
return stackArray[topOfStack--];
} else {
System.out.println("Stack is Empty");
return "-1";
}
}

public String peek(){
if(topOfStack >=0){
return stackArray[topOfStack];
}else {
System.out.println("Stack is Empty");
return "-1";
}
}

public void pushMany(String multipleValue){
String [] manyValues = multipleValue.split(" ");
for(int i =0; i<manyValues.length; i++){
push(manyValues[i]);
}
}

public static void main(String[] args) {
System.out.println("Create a Stack");
TheStack stack = new TheStack(10);
stack.printStack();
System.out.println();

System.out.println("Push first value 10");
stack.push("10");
stack.printStack();
System.out.println();

System.out.println("Push Second value 11");
stack.push("11");
stack.printStack();
System.out.println();

System.out.println("Pop top value in the stack");
System.out.println("The value popped up is: " + stack.pop());
stack.printStack();
System.out.println();

System.out.println("Peek top value in the stack");
System.out.println("The value is " + stack.peek());
stack.printStack();
System.out.println();

System.out.println("Push a couple of values in the stack");
stack.pushMany("12 14 54 56 43");
stack.printStack();
System.out.println();
}

}

输出结果

Create a Stack
---------------------------------------------------
|  0 |  1 |  2 |  3 |  4 |  5 |  6 |  7 |  8 |  9 |
---------------------------------------------------
|    |    |    |    |    |    |    |    |    |    |
---------------------------------------------------

Push first value 10
---------------------------------------------------
|  0 |  1 |  2 |  3 |  4 |  5 |  6 |  7 |  8 |  9 |
---------------------------------------------------
| 10 |    |    |    |    |    |    |    |    |    |
---------------------------------------------------

Push Second value 11
---------------------------------------------------
|  0 |  1 |  2 |  3 |  4 |  5 |  6 |  7 |  8 |  9 |
---------------------------------------------------
| 10 | 11 |    |    |    |    |    |    |    |    |
---------------------------------------------------

Pop top value in the stack
The value popped up is: -1
---------------------------------------------------
|  0 |  1 |  2 |  3 |  4 |  5 |  6 |  7 |  8 |  9 |
---------------------------------------------------
| 10 |    |    |    |    |    |    |    |    |    |
---------------------------------------------------

Peek top value in the stack
The value is 10
---------------------------------------------------
|  0 |  1 |  2 |  3 |  4 |  5 |  6 |  7 |  8 |  9 |
---------------------------------------------------
| 10 |    |    |    |    |    |    |    |    |    |
---------------------------------------------------

Push a couple of values in the stack
---------------------------------------------------
|  0 |  1 |  2 |  3 |  4 |  5 |  6 |  7 |  8 |  9 |
---------------------------------------------------
| 10 | 12 | 14 | 54 | 56 | 43 |    |    |    |    |
---------------------------------------------------

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