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learning java in 15 minutes is a challenge, but i can give you a condensed overview of the key concepts with examples to get you started. here’s a quick tutorial covering the basics of java.

1. what is java?

java is a high-level, object-oriented programming language designed to be platform-independent. it uses the "write once, run anywhere" (wora) principle, thanks to the java virtual machine (jvm).

2. setting up the environment

1. **download the jdk**: go to the [oracle website](https://www.oracle.com/java/technolog...) and download the java development kit (jdk).
2. **install an ide**: use an integrated development environment (ide) like intellij idea, eclipse, or vs code for better productivity.

3. basic syntax

here's a simple java program:

```java
public class helloworld {
public static void main(string[] args) {
system.out.println("hello, world!");
}
}
```

explanation:

**public class helloworld**: defines a public class named `helloworld`.
**public static void main(string[] args)**: the entry point of the program.
**system.out.println()**: prints text to the console.

4. variables and data types

java is statically typed, meaning you need to declare the type of variable.

```java
int age = 30; // integer
double salary = 50000.0; // double
char grade = 'a'; // character
string name = "john"; // string
boolean isemployed = true; // boolean
```

5. control structures

if-else statement

```java
if (age = 18) {
system.out.println("you are an adult.");
} else {
system.out.println("you are a minor.");
}
```

for loop

```java
for (int i = 0; i 5; i++) {
system.out.println("count: " + i);
}
```

6. functions/methods

define reusable code blocks with methods.

```java
public class calculator {
public static int add(int a, int b) {
return a + b;
}

public static void main(string[] args) {
int sum = add(5, 10);
syst ...

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