UC知道求达人帮忙解释下这个java类，谢谢！
来源：百度知道 编辑：UC知道 时间：2024/09/23 03:55:59
class StackOpr {//堆栈....
String [] st ;
int top = -1;
StackOpr () {
st = new String [20];
}
public void push (String s) {
top++;
st[top] = "";
st[top] = s;
}
public String take () {
return st[top--];
}
public String check() {
if (top == -1) {
return "";
}
return st[top];
}
public void clearStack() {
for (int i =0;i<20;i++){
st[i] ="";
}
top = -1;
}
}
String [] st ;
int top = -1;
StackOpr () {
st = new String [20];
}
public void push (String s) {
top++;
st[top] = "";
st[top] = s;
}
public String take () {
return st[top--];
}
public String check() {
if (top == -1) {
return "";
}
return st[top];
}
public void clearStack() {
for (int i =0;i<20;i++){
st[i] ="";
}
top = -1;
}
}
push函数将字符串入栈
take函数将字符串出栈
check函数检查栈是否为空
clearStack函数将栈清空并设置top为-1
栈里有20个空间,push()方法是入栈,
take()是出栈,
check()方法是判断栈是否为空,为空返回"",不为空就返回值,
clearStack()方法是将栈清空