1、會計(jì)學(xué)1Java核心邏輯核心邏輯JDK新特性新特性第1頁/共41頁第2頁/共41頁本章結(jié)構(gòu)本章結(jié)構(gòu)JDK新特性新特性JDK6新特性新特性JDK7新特性新特性二進(jìn)制字面值二進(jìn)制字面值腳本支持腳本支持JDK5新特性新特性訪問訪問javac的的api可變長參數(shù)可變長參數(shù)格式化輸入格式化輸入/輸出輸出枚舉枚舉注解注解靜態(tài)導(dǎo)入靜態(tài)導(dǎo)入第3頁/共41頁System.out.println(Math.PI);System.out.println(Math.abs(-1);第4頁/共41頁import static java.lang.Math.*;import static java.lang.System

2、.*;public class TestStatic public static void main(String args) System.out.println(PI);System.out.println(abs(-1);out.println(PI);第5頁/共41頁public static void print(String s) System.out.println(s);public static void main(String args) print();print(tom);print(tom,cat);public static void print(String. s

3、) for (String string : s) System.out.println(string);第6頁/共41頁public static void print1(String s) public static void print(String. s) for (String ss : s) System.out.println(ss);第7頁/共41頁public static void main(String. args) print();print(tom);print(tom, cat);第8頁/共41頁String name = 張三;int age = 20;Syste

4、m.out.printf(有個(gè)學(xué)生叫%s，他的年齡是%d。n, name, age);/ 創(chuàng)建格式化字符串String msg = String.format(有個(gè)學(xué)生叫%s，他的年齡是%d。, name, age);System.out.println(msg);第9頁/共41頁Scanner input = new Scanner(System.in);int i = input.nextInt();第10頁/共41頁enum Season SPRING, SUMMER, AUTUMN, WINTERpublic class TestEnum public static void main

5、(String args) Season season = Season.SPRING;第11頁/共41頁public class TestSeason public static void main(String args) Season season = Season.SPRING;class Season public static final Season SPRING = new Season();public static final Season SUMMER = new Season();public static final Season AUTUMN = new Seaso

6、n();public static final Season WINTER = new Season();private Season() 第12頁/共41頁public class TestEnum1 public static void main(String args) Season s = Season.SPRING;System.out.println(();/ SPRINGSystem.out.println(s.ordinal();/ 0enum Season SPRING, SUMMER, AUTUMN, WINTER第13頁/共41頁public class Te

7、stEnum2 public static void main(String args) Season season = Enum.valueOf(Season.class, SPRING);System.out.println(();第14頁/共41頁public class TestEnum3 public static void main(String args) Season seasons = Season.values();for (Season season : seasons) System.out.println(name is + season.nam

8、e() + ,ordinal + season.ordinal();第15頁/共41頁enum Season SPRING, SUMMER, AUTUMN, WINTER;private String name;public String getName() return name;public void setName(String name) = name;第16頁/共41頁public class TestEnum public static void main(String args) Season s = Season.SPRING;s.setName(tomca

9、t);System.out.println(s.getName();第17頁/共41頁enum Season SPRING, SUMMER, AUTUMN, WINTER第18頁/共41頁enum Season SPRING(春天), SUMMER(夏天), AUTUMN(秋天), WINTER(冬天);private String name;Season(String name) = name;public String getName() return name;public void setName(String name) = name;第19頁/

10、共41頁第20頁/共41頁enum Operator ADD public double calculate(double a, double b) return a+b; , SUBSTRACT public double calculate(double a, double b) return a-b; , MULTIPLY public double calculate(double a, double b) return a*b; , DIVIED/省略代碼; public abstract double calculate(double a,double b);第21頁/共41頁pu

11、blic class TestEnum public static void main(String args) Operator o = Operator.ADD;System.out.println(o.calculate(1, 2);第22頁/共41頁第23頁/共41頁public class Worker private String name;public void m1() public String toString() return name;第24頁/共41頁public class Worker private String name;public void m1() Ov

12、erridepublic String toStirng() return name;第25頁/共41頁第26頁/共41頁第27頁/共41頁第28頁/共41頁Target(value = ElementType.TYPE )Retention(value = RetentionPolicy.RUNTIME)interface First Firstpublic class TestAnnotation private String name;public void m1() 第29頁/共41頁Target(value = ElementType.TYPE )Retention(value =

13、RetentionPolicy.RUNTIME)interface First String value();First(test)public class TestAnnotation private String name;public void m1() 第30頁/共41頁第31頁/共41頁public class TestMethod Test(parameter = corejava)public void m1(String s1) System.out.println(method m1 + s1);public void m2(String s2) System.out.pri

14、ntln(method m2 + s2);第32頁/共41頁Target( ElementType.METHOD )Retention(RetentionPolicy.RUNTIME)public interface Test String parameter();第33頁/共41頁第34頁/共41頁public class TestAnnotation public static void main(String args) throws Exception / 獲得反射需要的類對象Class c = TestMethod.class;TestMethod t = (TestMethod)

15、c.newInstance();/ 獲得所有的方法Method m = c.getDeclaredMethods();for (Method mm : m) / 判斷哪個(gè)方法擁有Test標(biāo)注if (mm.isAnnotationPresent(Test.class) / 獲得Test標(biāo)注Test tt = mm.getAnnotation(Test.class);/ 獲得Parameter屬性的值String name = tt.parameter();mm.invoke(t, name);第35頁/共41頁/ 創(chuàng)建腳本引擎管理器ScriptEngineManager engineManager = new ScriptEngineManager();/ 獲得腳本引