Java Coding Problems

96. LVTI and null initializers, instance variables, and catch blocks variables

What does LVTI have in common with null initializers, instance variables, and catch blocks variables? Well, LVTI cannot be used with any of them. The following attempts will fail:

• LVTI cannot be used with null initializers:

// result in an error of type: variable initializer is 'null'var message = null;// result in: cannot use 'var' on variable without initializervar message;

• LVTI cannot be used with instance variables (fields):

public class Player {  private var age; // error: 'var' is not allowed here  private var name; // error: 'var' is not allowed here  ...}

• LVTI cannot be used in catch block variables:

try {  TimeUnit.NANOSECONDS.sleep(1000);} catch (var ...