编译通过，运行时却总抛出error

[dakjhflkjdsfk]

下面这段代码编译是通过的，运行时却总抛出下面的error，这是为什么呢
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOf(Unknown Source)
at java.lang.AbstractStringBuilder.ensureCapacityInternal(Unknown Source)
at java.lang.AbstractStringBuilder.append(Unknown Source)
at java.lang.StringBuffer.append(Unknown Source)
at practice.Expression.toPostfix(Expression.java:24)
at practice.Expression.main(Expression.java:96)


public class Expression
{
public static StringBuffer toPostfix(String infix)
{
Stack<String> stack = new SeqStack<String>(infix.length());
StringBuffer postfix = new StringBuffer(infix.length()*2);
int i = 0;
while(i<infix.length())
{
char ch = infix.charAt(i);
switch(ch)
{
case'+': case'-':
while(!stack.isEmpty()&&!stack.peek().equals("("))
postfix.append(stack.pop());
stack.push(ch+"");
i++; break;

case'*': case'/':
while(!stack.isEmpty()&&(stack.peek().equals("*")||
stack.peek().equals("/")))
postfix.append(ch);
stack.push(ch+"");
i++; break;

case'(':
stack.push(ch+"");
i++; break;

case')':
String out = stack.pop();
while(out!=null&&!out.equals("("))
{
postfix.append(out);
out = stack.pop();
}
i++; break;

default:
while(i<infix.length()&&ch>='0'&&ch<='9')
{
postfix.append(ch);
i++;
if(i<infix.length())
ch = infix.charAt(i);
}
postfix.append(" ");
}
}
while(!stack.isEmpty())
postfix.append(stack.pop());
return postfix;

}

public static int toValue(StringBuffer postfix)
{
Stack<Integer> stack = new LinkedStack<Integer>();
int value = 0;
for(int i=0; i<postfix.length(); i++)
{
char ch = postfix.charAt(i);
if(ch>='0'&&ch<='9')
{
value = 0;
while(ch!=' ')
{
value = value*10+ch-'0';
ch = postfix.charAt(++i);
}
stack.push(value);
}
else
if(ch!=' ')
{
int y = stack.pop(), x = stack.pop();
switch(ch)
{
case'+': value = x+y; break;
case'-': value = x-y; break;
case'*': value = x*y; break;
case'/': value = x/y; break;
}
//System.out.print(x+(ch+"")+y+"="+value+",");
stack.push(value);
}
}
return stack.pop();
}
public static void main(String[] args)
{
// TODO 自动生成的方法存根
String infix = "123+10*(45-50+20)/((35-25)*2+10)-11";
StringBuffer postfix = toPostfix(infix);
System.out.println("infix="+infix+"\npostfix="+postfix
+"\nvalue="+toValue(postfix));
}

}

[落雨尘封]

case'*': case'/': while(!stack.isEmpty()&&(stack.peek().equals("*")|| stack.peek().equals("/"))) postfix.append(ch); stack.push(ch+""); i++; break; 这里死循环了吧，一直append然后就oom了 {}没加？

[dakjhflkjdsfk]

天哪噜.....我居然深陷其中，死活没发现 谢谢！！！

[尼古拉斯-全蛋]

目测有死循环

[Smiletotakeyoufly]

看报错提示就可以，OutOfMemoryError 内存溢出了

[Be_nurturing]

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space 这一句都已经说了

[qq_29593929]

不加{}出错真的好读么

[weixin_44766586]

case '*': case '/': while (!stack.isEmpty() && (stack.peek().equals("*") || stack.peek() .equals("/"))) postfix.append(stack.pop()); stack.push(ch + ""); i++; break; postfix.append(stack.pop());這一行錯了

[DAVE-BLACK]

你加内存啊。。。。。。。。