来京学习第16天

明天、后天出去休假，星期五在家休息，星期六和星期天上课，一直到下周五，连续7天要上课。我实际上，不想突然闲死，然后，再累死，入乡随俗吧。。。

今天的学习内容

object的getClass反射

package com.hhl.test20150728;

import java.lang.reflect.Field;
import java.lang.reflect.Method;

public class TestObjectFanshe {
public static void main(String[] args) {
Student han=new Student();
Class<? extends Student> class1=han.getClass();
Class<? extends Student> class2=Student.class;
Field[] f1=class1.getFields();//公共字段
Field[] f2=class1.getDeclaredFields();//所有字段
Method[] m=class2.getDeclaredMethods();//所有方法

Field f3;
try {
f3 = class1.getDeclaredField("age");//取字段
f3.setAccessible(true);//更改访问权限
f3.setInt(han,20);//设置私有成员的值
f3.setAccessible(false);
for(int i=0;i<f2.length;i++){
System.out.println(f2[i].getName());
}
System.out.println("年龄："+han.getAge());
System.out.println("------------------");
for(int i=0;i<m.length;i++){
System.out.print(m[i].getName()+"  ");
Class[] p=m[i].getParameterTypes();//参数类型取 Class
for(int j=0;j<p.length;j++){
System.out.println("参数："+p[j].getName());
}
System.out.println();
}
}catch (IllegalArgumentException | IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchFieldException | SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

}

注解Annotation的应用

package com.hhl.test20150728;

public class Student {
private int age=20;
private String name;
private String sex;
public int getAge() {
return age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public void setAge(int age) {
this.age = age;
}

}
package com.hhl.test20150728;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME)
public @interface MyAnnotation {
String name1() default "zhang3";
String sex1();
int age1();
}
package com.hhl.test20150728;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME)
public @interface NumAnnotation {
int num1();
}
package com.hhl.test20150728;

import java.lang.reflect.Field;

public class Clazz {
@NumAnnotation(num1=101)
private int num;
@MyAnnotation(age1 = 10, sex1 = "male")
private Student z3;
@MyAnnotation(age1 = 8, sex1 = "male", name1 = "li4")
private Student l4;
@MyAnnotation(age1 = 7, sex1 = "female", name1 = "wang5")
private Student w5;
private Student h6;

public Clazz() {
zhujie();
}

public Student getZ3() {
return z3;
}

public void setZ3(Student z3) {
this.z3 = z3;
}

public Student getL4() {
return l4;
}

public void setL4(Student l4) {
this.l4 = l4;
}

public Student getW5() {
return w5;
}

public void setW5(Student w5) {
this.w5 = w5;
}

public Student getH6() {
return h6;
}

public void setH6(Student h6) {
this.h6 = h6;
}

public void zhujie()    {
Class<? extends Clazz> cla = Clazz.class;
Field[] fs = cla.getDeclaredFields();
for (int i = 0; i < fs.length; i++) {
Field f = fs[i];
MyAnnotation mya = f.getAnnotation(MyAnnotation.class);
if (mya != null) {
f.setAccessible(true);
Student st = new Student();
st.setAge(mya.age1());
st.setName(mya.name1());
st.setSex(mya.sex1());
try {
f.set(this, st);
f.setAccessible(false);
}catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}else{
NumAnnotation numa=f.getAnnotation(NumAnnotation.class);
if(numa!=null){
f.setAccessible(true);
System.out.println(numa.num1());
}
}
}
}

public int getNum() {
return num;
}

public void setNum(int num) {
this.num = num;
}
}
///////////////////////////////////////////
package com.hhl.test20150728;

public class TestAnnotation {
public static void main(String[] args) {
Clazz c=new Clazz();
System.out.println(c.getZ3().getName());
System.out.println(c.getL4().getName());
System.out.println(c.getW5().getName());
//System.out.println(c.getH6().getName());
}

}

Android环境的搭建

1、安装Android Studio

2、通过Project Structure 找到Android SDK

3、安装GenymotionShell虚拟电脑

4、通过Oracle VM VirtualBox的管理导入虚拟电脑，开启一个虚拟机

5、在Android Studio创建工程。

6、给Android Studio安装Genymotion插件

1）打开Android Studio，依次【File】-【Settings】

2）在打开的settings界面里找到plugins设置项，点击右侧的“Browser。。”按钮

3）在搜索栏里输入genymotion关键字，可以看到右侧已经搜索到插件，点击install安装。

4）安装后重新启动Android Studio，我们就可以工具栏看到genymotion插件的图标。

5）初次点开需要我们设置一下genymotion的安装目录(C:\program files\Genymobile\Genymotion)。

6）设置好目录，我们再次点击工具栏的图标就可以进行虚拟机的配置和启动了。