Exception in thread "main" java.lang.NullPointerException error

Question

please help me. I'm getting a null pointer exception error in my code. Here it is:

    File strfile = new File("15.json");
    Scanner scan = new Scanner (strfile);

    while(scan.hasNextLine())
    {
        String line = scan.nextLine();
        Status statjson = DataObjectFactory.createStatus(json);
        String text = statjson.getText();

    if (text == null)
    {
        System.out.print("null");
    }
           else { System.out.print(text); }     }

it runs for the first few lines that have a "text" field but the moment it comes across a line without "text" it throws a null pointer exception instead of printing "null" on the console. Help please!

Answer 1

使用==运算符检查对象引用

if (text == null)

Answer 2

Change this:

if(text.equals(null))

to:

if(text == null)

Answer 3

If 'text' is null, text.equals will throw a NPE. Use the == operator.