//First way Method public static void main(String[] args) { printMessage(); add(5,9); multiply(10, 10); boolean sum = sum(3,1,5); System.out.println(sum); } public static void printMessage() { System.out.println("hapy birthday to you: "); } public static void add(int a, int b) { System.out.println(a + b); } public static void multiply(int a, int b) { System.out.println(a * b); } } //output: hapy birthday to you: 14 100 // second way Return Method: public static void main(String[] args) { int sum = add(5,9); System.out.println(sum); int product = multiply(10,10); System.out.println(product); } public static int add(int a, int b) { return a+b; } public static int multiply(int a, int b) { return a * b; } } //output: 14 100 // String type Method. public static void main(String[] args) { String name = self("my name is mohamed, i am 20 years old!"); System.out.println(name); String home = house("My house is very beautifull! "); System.out.println(home); } public static String self(String n) { return n.toLowerCase(); } public static String house(String h) { return h.toUpperCase(); } } //Array Method: public static void main(String[] args) { String array = myArray("This is my aweosme array:"); System.out.println(array); int[] awesomeArray = arrayFromInt(4, 6, 7, 8); System.out.println(awesomeArray[0]); System.out.println(awesomeArray[1]); System.out.println(awesomeArray[2]); System.out.println(awesomeArray[3]); } public static String myArray(String a) { return a.toUpperCase(); } public static int[] arrayFromInt(int a, int b, int c, int d) { int[] array = new int[4]; array [0] = a; array [1] = b; array [2] = c; array [3] = d; return array; } //output: THIS IS MY AWEOSME ARRAY: 4 6 7 8 public static boolean sum(int x, int y, int z) { if(x<=y && y<= z ) { return true; } else { return false; } } } //output: false
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