public class HelloWorld{\n public static void main(String[] args){\n System.out.println(\"hello world\");\n }\n}<\/code><\/pre>\n\n\n\n
public class HelloWorld{\n public static void main(String[] args){\n int x=0;\n while(x<10){\n System.put.println(x);\n x=x+1;\n }\n x=\"horse\";\n }\n}<\/code><\/pre>\n\n\n\n
1. Before Java variables can be used, they must be declared. 2. Java variables must have a specific type. 3. Java variable types can never change. 4. Types are verified before the code even runs!!!<\/p>\n\n\n\n
public class LargerDemo{\n\/** Returns the Larger of x and y.*\/\n public static int larger(int x, int y) {\n if (x > y) {\n return x;\n }\n return y;\n }\n public static void main(String[] args){\n System.out.println(larger(-5, 10));\n }\n}\n\/*\n1. Functions must be declared as part of a class in Java. A function that is part of a cLass is calLed a \"method\". So in Java, all functions are methods.\n2. To define a function in Java, we use \"public static\". We will see alternate ways of defining functions Later. \n3. ALL parameters of a function must have a decLared type,\nand the return value of the function must have a decLared type. Functions in Java return onLy one value!\n*\/\n<\/code><\/pre>\n\n\n\n
public class Dog{\n public static void makeNoise(){\n System.out.println(\"Bark!\");\n }\n}\npublic class DogLauncher{\n public static void main(String[] args){\n Dog. makeNoise();\n } \n}<\/code><\/pre>\n\n\n\n
public class Dog{\n public int weightInPounds;\n\n public \/*static*\/ void makeNoise(){ \n if (weightInPounds <10){\n System.out. println(\"yip!\");\n } else if (weightInPounds < 30){ \n System.out. println(\"bark.\");\n } else{\n System.out. println(\"woooof!\");\n }\n } \n} \n<\/code><\/pre>\n\n\n\n
public class DogLaimcher{\n public static void main (String[] args)\n Dog d =new Dog();\n d.weightInPounds=51;\n d.makeNoise();\n }\n}<\/code><\/pre>\n\n\n\n
\u6784\u9020\u51fd\u6570\uff1a<\/p>\n\n\n\n
public Dog(int w){\n wewightInPounds=w;\n}<\/code><\/pre>\n\n\n\n
public class DogLoop {\n public static void main(String[] args) {\n Dog smallDog = new Dog(5);\n Dog mediumDog = new Dog(25);\n Dog hugeDog = new Dog(150);\n\n Dog[] manyDogs = new Dog[4];\n manyDogs[0] = smallDog;\n manyDogs[1] = hugeDog;\n manyDogs[2] = new Dog(130);\n\n int i = 0;\n while (i < manyDogs.length) {\n Dog.maxDog(manyDogs[i], mediumDog).makeNoise();\n i = i + 1;\n }\n }\npublic static class Dog {\n \/* Size of the dog in standard dog size units. *\/\n public int size;\n\n \/* This is a constructor. It tells us how to construct\n\t * dogs from our ideal notion of dogness. *\/\n\n public Dog(int s) {\n size = s;\n }\n\n public void makeNoise() {\n if (size < 10) {\n System.out.println(\"hideous yapping\");\n } else if (size < 30) {\n System.out.println(\"bark!\");\n } else {\n System.out.println(\"woof!\");\n }\n }\n\n \/* Return the larger of dog d1 and dog d2. *\/\n public static Dog maxDog(Dog d1, Dog d2) {\n if (d1.size > d2.size) {\n return d1;\n }\n return d2;\n } \n }\n}\n<\/code><\/pre>\n\n\n\n
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