println("Sumar: ") println(age + age2) println("Restar: ") println(age - age2)

Here's the corrected Java code:

```java
public class Main {
    public static void main(String[] args) {
        int age = 25; // declare and initialize age variable
        int age2 = 30; // declare and initialize age2 variable

        System.out.println("Sumar: ");
        System.out.println(age + age2);

        System.out.println("Restar: ");
        System.out.println(age - age2);
    }
}
```

However, in Java, it's conventional to use `System.out.println()` instead of `println()`. Also, the `main` method is the entry point of the program, so it should be declared as `public static void main(String[] args)`.

Note: The `println()` method is a part of the `PrintStream` class, which is imported by default in Java. However, it's good practice to use the fully qualified name `System.out.println()` to avoid any potential issues.