“未声明”错误是什么意思？

Question

I am new to java programming. I tried hello world program, but I got an error " not a statement ". Whereas when I copy, paste the hello world program from the internet, my program compiled. This is the program I used. What is meant by " not a statement ", please explain why I got this error and what is meant by it and what should I look for when I get this error in the future. Thanks!

public class hello
{
    public static void main(String args[]) {    
        System.out.println(“hello world”);
    }
}

My errors:-

hello.java:8: error: illegal character: '\u201c'
       System.out.println(“hello world”);
                          ^
hello.java:8: error: ';' expected
       System.out.println(“hello world”);
                           ^
hello.java:8: error: illegal character: '\u201d'
       System.out.println(“hello world”);
                                         ^
hello.java:8: error: not a statement
       System.out.println(“hello world”);
                                 ^
4 errors

Answer 1

You code cannot contain smart quotes like your used in your "Hello World". I replaced your smart/fancy quotes with the correct kind.

public class hello
{
    public static void main(String args[]) {    
        System.out.println("hello world");
    }
}