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Package Statement After Import Statement

Package Statement After Import Statement

No, in Java, the package statement must be the first statement in a source file (excluding comments and blank lines). It must precede any import statements. If you place an import statement before the package statement, it will result in a compilation error.

Package Statement After Import Statement

Correct Order of Statements

  • 1. Package Statement: Defines the package to which the class belongs. It must be the first line of code in the file.
  • 2. Import Statements: Allow the use of classes from other packages. These come after the package statement.
  • 3. Class/Interface Definitions: The main body of the file, containing class or interface definitions, comes after the import statements.

Correct Example
```java 
// File: com/example/myapp/MyClass.java

// Package statement
package com.example.myapp;

// Import statements
import java.util.List;
import java.util.ArrayList;

public class MyClass {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>();
        list.add("Hello, World!");
        System.out.println(list.get(0));
    }
}
```

Incorrect Example
```java 
// File: com/example/myapp/MyClass.java

// Incorrect order: import statement before package statement
import java.util.List;
import java.util.ArrayList;

// This will cause a compilation error
package com.example.myapp;

public class MyClass {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>();
        list.add("Hello, World!");
        System.out.println(list.get(0));
    }
}
```

Compilation Error

Placing import statements before the package statement will result in a compilation error, as the Java compiler expects the package statement to be the very first statement in the source file.

Error Example:
```java 
error: class, interface, or enum expected
import java.util.List;
^
```

Summary

In Java, the package statement must come first in a source file, before any import statements or class/interface definitions. Following this order ensures that the Java compiler can correctly identify the package structure and resolve dependencies. Placing import statements before the package statement will lead to a compilation error.

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