Computer Science 1 Honors
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1 Computer Science 1 Honors
2 Will be
3 Most methods are too complex simply to call them and let them do their job. Methods almost always need more information. For example, a method that finds a square root, needs to know what number to take the square root of.
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8 The method max in the Math class: takes two numbers returns the bigger number max expects two numbers as parameters These are its formal parameters. When you call Math.max(6,8) 6 & 8 are passed to max as its actual parameters.
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11 public mymethod(int static foo, void String mymethod(); par);
12 parameters public mymethod(int static foo, void String mymethod(); par);
13 Two parameters are declared integer name foo String named bar Parameter types mymethod(int foo, String par);
14 Two parameters are declared integer name foo String named par Parameter names mymethod(int foo, String par);
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16 //Draws a bar made using the String mark of a given length public static void drawbar (int length, String mark){ for(int num=0; num<length; ++num) System.out.print(mark); System.out.println();
17 //Draws a bar made using the String mark of a given length public static void drawbar (int length, String mark){ for(int num=0; num<length; ++num) System.out.print(mark); System.out.println();
18 //Draws a bar made using the String mark of a given length public static void drawbar (int length, String mark){ for(int i=0; i<length; i++) System.out.print(mark); System.out.println( );
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20 name Recall that up until now we ve left them blank
21 One parameter (in this case, the String foo): myclass.mymethod( Foo ); More than one parameter: Math.max(4,9); Can also be variables or expressions: Math.max(x,y+z);
22 Parameters must be in the same order as specified in the method Recall our drawbar method required an integer and a string OK Bad drawbar(6, = ); drawbar( =,6);
23 You must pass the same number of parameters that the method expects Bad Math.max(4,7,9);
24 Include the types when declaring parameters but never when passing them Don t do this when calling drawbar: drawbar(int myint, String mark);
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26 //Draws a bar made using the String mark of a given length public static void drawbar (int length, String mark){ for(int num=0; num<length; ++num) System.out.print(mark); System.out.println(); //Calling code DrawBar(3, = ); drawbar Method
27 //Draws a bar made using the String mark of a given length public static void drawbar (int length, String mark){ for(int num=0; num<length; ++num) System.out.print(mark); System.out.println(); //Calling code DrawBar(3, = ); Calls the drawbar Method and passes 6 and * as parameters
28 //Draws a bar made using the String mark of a given length public static void drawbar (int length, String mark){ for(int num=0; num<length; ++num) System.out.print(mark); System.out.println(); //Calling code DrawBar(3, = ); In drawbar, length is 6 and mark is *
29 //Draws a bar made using the String mark of a given length public static void drawbar (int length, String mark){ for(int num=0; num<length; ++num) System.out.print(mark); System.out.println(); //Calling code DrawBar(3, = ); Prints 6 stars
30 //Draws a bar made using the String mark of a given length public static void drawbar (int length, String mark){ for(int num=0; num<length; ++num) System.out.print(mark); System.out.println(); //Calling code DrawBar(3, = ); When the method is done, it exits.
31 //Draws a bar made using the String mark of a given length public static void drawbar (int length, String mark){ for(int num=0; num<length; ++num) System.out.print(mark); System.out.println(); //Calling code DrawBar(3, = ); drawbar is called with length 3 and mark =
32 //Draws a bar made using the String mark of a given length public static void drawbar (int length, String mark){ for(int num=0; num<length; ++num) System.out.print(mark); System.out.println(); //Calling code DrawBar(3, = ); Prints 3 equal signs
33 //Draws a bar made using the String mark of a given length public static void drawbar (int length, String mark){ for(int num=0; num<length; ++num) System.out.print(mark); System.out.println(); //Calling code DrawBar(3, = ); The drawbar exits
34 //Draws a bar made using the String mark of a given length public static void drawbar (int length, String mark){ for(int num=0; num<length; ++num) System.out.print(mark); System.out.println(); //Calling code DrawBar(3, = ); Again program continues with next statement after method call
35 //Draws a bar made using the String mark of a given length public static void drawbar (int length, String mark){ for(int num=0; num<length; ++num) System.out.print(mark); System.out.println(); //Calling code DrawBar(3, = ); drawbar is called again with length 6 and mark *
36 //Draws a bar made using the String mark of a given length public static void drawbar (int length, String mark){ for(int num=0; num<length; ++num) System.out.print(mark); System.out.println(); //Calling code DrawBar(3, = ); 6 stars print
37 //Draws a bar made using the String mark of a given length public static void drawbar (int length, String mark){ for(int num=0; num<length; ++num) System.out.print(mark); System.out.println(); //Calling code DrawBar(3, = ); Again program continues with next statement after method call
38 Questions?
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