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Java基础第一节：从HelloWorld到面向对象.docx

linux环境下用makefile编译简单的helloworld程序，里面有详细的编译步骤，有写makefile文件时需要注意的一些细节，读者只需按照说明，按部就班地执行就可以成功，欢迎下载！

// // main.m // Hello World_Code // #import #import "AppDelegate.h" int main(int argc, char *argv[]) { @autoreleasepool { return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class])); } } // // AppDelegate.h // Hello World_Code // #import @interface AppDelegate : UIResponder @property (strong, nonatomic) UIWindow *window; @end // // AppDelegate.m // Hello World_Code // #import "AppDelegate.h" @implementation AppDelegate - (void)dealloc { [_window release]; [super dealloc]; } - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease]; self.window.backgroundColor = [UIColor whiteColor]; [self.window makeKeyAndVisible]; UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(320/2.0 - 140/2.0, 80, 140, 40)]; // 1 label.text = @"Hello World"; label.backgroundColor = [UIColor cyanColor]; label.textAlignment = NSTextAlignmentCenter; [self.window addSubview:label]; // 2 [label release]; // 1 return YES; } - (void)applicationWillResignActive:(UIApplication *)application { // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state. // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game. } - (void)applicationDidEnterBackground:(UIApplication *)application { // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current

2021Java零基础自学笔记资源（四）