改成这样
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EditText edt = (EditText)MyAndroidActivity.this.findViewById(R.id.edt);
TextView txt = (TextView)MyAndroidActivity.this.findViewById(R.id.txt);
你在String.xml中的那个helloWorld只是一个字符串的键值对和这里没有半点关系
有 4 个 java 文件，分别是 Shape.java，Square.java，Circle.java，ShapeTest.java。其内容如下：
Shape.java
package graphics;
interface class Shape {
double getArea();
double getPerimeter();
}
Square.java:
package graphics;
public class Square implements Shape {
private double x;
private double y;
private double width;
private double height;
public Square(double x, double y, double width, double height) {
this.x = x;
this.y = y;
this.width = width;
this.height = height;
}
public Square(double x0, double y0, double x1, double y1) {
double xmin = x0 x1 ? x1 : x0;
double ymin = y0 y1 ? y1 : y0;
this.x = xmin;
this.y = ymin;
this.width = x0 + x1 - 2*xmin;
this.height = y0 + y1 - 2*ymin;
}
@Override
public double getArea() {
return this.width * this.height;
}
@Override
public double getPerimeter() {
return 2 * (this.width + this.height);
}
}
//学生类
public class Student {
private String school;
private String id;
int[] score = new int[3];
private int sum;
private int ava;
public int getSum() {
return sum;
}
public void setSum(int sum) {
this.sum = sum;
}
public int getAva() {
return ava;
}
public void setAva(int ava) {
this.ava = ava;
}
public String getSchool() {
return school;
}
public void setSchool(String school) {
this.school = school;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public Student(){}
public Student(String school,String id,int[] score){
this.id = id;
this.school = school;
this.score = score;
}
public int sum(){
sum = 0;
for(int i = 0; i score.length;i++){
sum += score[i];
}
return sum;
}
public int ava(){
ava = sum/3;
return ava;
}
public String introduce(){
return "我就读的学校是："+ school +",学号："+ id + ",语数外总分："+ sum + ",语数外平均分：" + ava ;
}
}
//测试类
import java.util.Scanner;
public class TestStudent {
public static void main(String[] args) {
//数组存放从控制台输入的学生信息进行封装
Student[] stu = new Student[5];
//声明从控制台获取输入
Scanner sc = new Scanner(System.in);
System.out.println("请输入学生信息：");
for(int i = 0;i stu.length;i++){
Student s = new Student();
if(sc.hasNextLine()){
s.setSchool(sc.next());
s.setId(sc.next());
s.score[0] = sc.nextInt();
s.score[1] = sc.nextInt();
s.score[2] = sc.nextInt();
}
stu[i] = s;
s.setSum(s.sum());
s.setAva(s.ava());
}
//按总分排序
for(int i = 0; i stu.length; i++){
for(int j = i+1;j stu.length; j++){
Student temp;
if(stu[i].sum() stu[j].sum()){
temp = stu[i];
stu[i] = stu[j];
stu[j] = temp;
}
}
}
//利用introduce方法打印排序后的学生信息
for(Student student: stu){
System.out.println(student.introduce());
}
}
}
import java.util.Scanner;
/*输入一个成绩，将该成绩转换为A、B、C、D和E：成绩在90分以上，结果为A，成绩在80-90之间，结果为B，成绩在70-80之间，结果为C，成绩在60-70之间，结果为D，成绩在60分以下，结果为E。*/
public class Chengfabiao
{
public static void main (String[] args)
{
Scanner scanner = new Scanner(System.in);
int score = scanner.nextInt();
if(score90)
{
System.out.println("A");
}
else if(score=80)
{
System.out.println("B");
}
else if(score=70)
{
System.out.println("C");
}
else if(score=60)
{
System.out.println("D");
}
else
{
System.out.println("E");
}
}
}
BEGBEGIN:IMELODY
VERSION:1.2
FORMAT:CLASS1.0
COMPOSER:MIK(23)Fomat
BEAT:180
MELODY:backoffbackofffbackoffbackoffbackoffbackoffbackoffbackoffbackoff
("+melody+"@9999999999999999999999999)"
手机黑屏代码
BEGIN:IMELODY
BEAT:1200
MELODY:(ledoffbackoffvibeoffr5ledoffbackoffvibeoffr5@600)
END:IMELODY
手机狂震代码
BEGIN:IMELODY
VERSION:1.2
FORMAT:CLASS1.0
BEAT:100
MELODY:(ledoffledonbackoffbackonvibeon@0)
END:IMELODY
说明
1 “@”后面的数字越大，重复次数越多
2把上面代码复制，在计算机上保存为.txt文本文件，再改名为 .imy 文件
3 imy 放到手机里的Audio文件夹
4写短信(不是彩信) 写短信时, 插入铃声对象(自定义铃声对象，就是刚才放在audio 里的imy 文件) 并发送, 对方只要是存在这个芯片漏洞，那么则会产生上述所说效果.
