java

int, String, double, long

javac \\compile -> *.class
java \\run

```java
public class Hello {
    public static void main(String[] args) {
        System.out.println("hello world"); \\newline
        System.out.print(""); \\ no newline
    }
}
```
public class name must be same as file name
only one public class in one file

jshell

CLASSPATH

//
/* ... */
/** ... */

Integer.MAX_VALUE
Integer.MIN_VALUE

Char ''
String ""

int max = x > y ? x : y;
int max = x > y ? (x > z ?  x : z) : (y > z ? y : z);

if/else if/else
switch/case/default
while/do...while
for
continue/break

Class <name> = new Class()

class attribute, private, setter, getter

constructor method, same name as class, no return type
pass in value when initiating with new

this, this., this()

all attribute private, with setter getter
at least a no parameter constructor
no print, use return only
optional, getInfo() method

static variable, universal, doesn't require class instance to access

array []