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Normally, signed and unsigned data types just refer to whether or not a value can be negative or not.

An unsigned 4-bit value can be the values 0 to 15

A signed 4-bit value can be the values -8 to 7

However, there is no such thing as an unsigned value in Java*. All primitive types are signed by default and cannot change.

*Note that technically a char value can be considered an unsigned type. The only way to see this is to declare a char with value '\uffff' (or 65535) and try to print it out as both a short and an int. If you try this with any other data types, the larger values will display the same as the smaller values. Not so with the char example.

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