Java learning: methods

Method is placed in two different Java files, one refers to the storage of the corresponding business logic,

Another Java file is to control only the input and output (that is, the user interface).

Calc Method:

/** Method*/ public classCalc {//method identifiers to note: static and type of method double     public Static DoubleAddDoubleADoubleB) {        Doubler = A +b; returnr; }         public Static DoubleSubDoubleADoubleB) {        Doubler = a-b; returnr; }         public Static DoubleMulDoubleADoubleB) {        DoubleR = A *b; returnr; }         public Static DoubleDivDoubleADoubleB) {        Doubler = a/b; returnr; }}

Test method (user interface):

Importjava.util.Scanner; public classTestcalc public Static voidmain (String Args[]) {//Accept DataScanner sc =NewScanner (system.in); System.out.println ("num1:"); DoubleNUM1 =sc.nextdouble (); //Accept operatorSystem.out.println ("opp:"); String opp=Sc.next (); //char opp1 = Opp.charat (index);System.out.println ("num2"); Doublenum2 =sc.nextdouble (); Doubled = 0; //invoke the appropriate business logic        Switch(opp)) {            //note: The switch statement does not support string type parameters before the JDK7 Version.              case"+": D=Calc.add (num1,num2);  break;  case"-": D=calc.sub (num1,num2);  break;  case"*": D=Calc.mul (num1,num2);  break;  case"/": D=Calc.div (num1,num2);  break; default: System.out.println ("errormessage!");  break; }    }}

Java learning: methods