Wrapper classes can be constructed by passing the value to the appropriate constructor. : Wrapper classes « Utility Classes « SCJP

1. SCJP
2. Utility Classes
3. Wrapper classes

public class MainClass {
  public static void main(String[] argv) {
    boolean primitiveBoolean = true;
    Boolean wrappedBoolean = new Boolean(primitiveBoolean);

    byte primitiveByte = 41;
    Byte wrappedByte = new Byte(primitiveByte);

    char primitiveChar = 'M';
    Character wrappedChar = new Character(primitiveChar);

    short primitiveShort = 31313;
    Short wrappedShort = new Short(primitiveShort);

    int primitiveInt = 12345678;
    Integer wrappedInt = new Integer(primitiveInt);

    long primitiveLong = 12345678987654321L;
    Long wrappedLong = new Long(primitiveLong);

    float primitiveFloat = 1.11f;
    Float wrappedFloat = new Float(primitiveFloat);

    double primitiveDouble = 1.11111111;
    Double wrappedDouble = new Double(primitiveDouble);
  }
}