扩展赋值运算符package operator; public class Demo07 { public static void main(String[] args) { int a 10; int b 20; ab; //aab a-b; //aa-b System.out.println(a); //字符串连接符 System.out.println(ab); //30 System.out.println(ab); //1020 System.out.println((ab)); //30 System.out.println(ab); //30 //出现字符串在前面后面的也会被识别为字符串类型 String name1 123; String name2 321; int a1 123; System.out.println(name1name2); //123321 System.out.println(name1a1); //123321 System.out.println(a1name1); //123321 } }条件运算符package operator; //三元运算符 public class Demo08 { public static void main(String[] args) { //x ? y : z //如果x的结果为true则输出y反之输出z int score 40; String type score60 ? 及格 : 不及格; System.out.println(type); //及格 } }包机制新建包命名公司域名倒过来com.baidu.www)包下会有www等包在包下新建包。引入包import 包名*表示引入该目录下的全部JavaDocJavaDoc命令用于生成自己的API文档生成或更新API文档流程IDEA设置-Apifox-设置令牌和项目右键上传到apifoxcmd生成JavaDoc文档对应文件目录下打开cmdjavadoc -encoding UTF-8 -charset UTF-8 文件名.javapackage com.fatbread.base; /** * author fatbread * version 1.0 * since 1.8 */ //以上为类注释 public class Doc { String name; /** * author fatebread * param name * return * throws Exception */ //以上为方法注释 static String test(String name)throws Exception{ return name; } }IDEA生成JavaDoc文档IDEA工具-生成JavaDoc选择文件和输出目录语言区域zh_CN命令行实参-encoding UTF-8 -charset UTF-8