Integer.parseInt错误

Question

I just began Java. I am trying to compile this program

class poop{
  public static void main(String[] args){
    System.out.println(Integer.parseInt("1"));
  }
}

But I get this error

poop.java:3: error: cannot find symbol
System.out.println(Integer.parseInt("1"));
                          ^
  symbol:   method parseInt(String)
  location: class Integer
./Integer.java:5: error: cannot find symbol
Int a=5;
^
  symbol:   class Int
  location: class Integer
2 errors

What's up?

I'm using JDK 7 on Lubuntu

Answer 1

You have named your java file Integer , but

1. That doesn't match the class name inside the file ( poop ), and
2. It shadows java.lang.Integer .

Name the file the same thing as the top-level class it contains, and definitely not Integer .