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# Java Tutorial: Number Literals

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Numbers can be written in Java as decimals, hexidecimal, or octal.

To input in octal notation, prefix with `0`.

To input in hexdecimal notation, prefix with `0x`. Letters A to F can be either lower case or upper case.

A integer literal is of type “long” if it is suffixed with `L` or lower case `l`; otherwise it is of type “int”.

```class Test {
public static void main(String[] arg) {
int x1 = 10; // 10 in decimal
int x2 = 012; // 10 in octal
int x3 = 0xA; // 10 in hexdecimal

System.out.println( x1 );
System.out.println( x2 );
System.out.println( x3 );
}
}
```

If a number is written with the decimal point, it is automatically of type “double”.

You can append `f` to a number to indicate it's a type “float”. Similarly, `d` for “double”.

```Examples of float literals:
1e1f    2.f     .3f     0f      3.14f   6.022137e+23f

Examples of double literals:

1e1     2.      .3      0.0     3.14    1e-9d   1e137
```

Java Lang Spec: lexical