upString(String
String
lowString(String
s)
对形参s进行小写转换，并返回转换后的字符串给调用者。
2）
main()方法：
public
static
void
main(String
args[])
{
String
s
BufferedReader
br=new
BufferedReader(InputStreamReader(System.in))
System.out.println(“请输入要转换的字条串：”)
s=br.readLine()
if(s!=null)
{
System.out.println(s+”转换为大写后为：”+Covert.upString(s))
System.out.println(s+”转换为小写后为：”+Covert.lowString(s))
}
else
System.out.println(“输入错误。”)
}
第一题看的脑壳疼，但是和第二题的意思差不多，我帮你做了第二题
public class List {public static void main(String[] args) {
Employee e1 = new Employee("张强","2010/09/01",6890)
e1.show("普通")
System.out.println("年纳税："+e1.tax())
Manager m1 = new Manager("朱慧","2003/07/06",18530,38000)
m1.show("管理")
System.out.println("年纳税："+m1.tax())
}
}
//下面是补全的代码
class Employee{
String name,date
double salary,bonus
Employee(String name,String date,double salary){
this.name = name
this.date = date
this.salary = salary
}
public void show(String str){
System.out.println("岗位:"+str)
System.out.println("姓名:"+name+",入职时间:"+date+",月薪:"+salary)
}
public double tax(){
if(salary <= 0){
throw new RuntimeException("工资不允许小于等于0")
}
else if(salary>3000 && salary<=5000){
salary = salary*0.05*12 //纳税这里我也不知道他们具体是怎么个算法，反正意思差不多，套进去就行了
}
else if(salary>5000 && salary<=10000){
salary = salary*0.1*12
}
else if(salary>10000 && salary<=15000){
salary = salary*0.15*12
}
else if(salary>15000){
salary = salary*0.2*12
}
return salary+(bonus*0.2)
}
}
class Manager extends Employee{
Manager(String name,String date,double salary,double bonus){
super(name,date,salary)
super.bonus = bonus
}
public void show(String str){
System.out.println("岗位:"+str)
System.out.println("姓名:"+name+",入职时间:"+date+",月薪:"+salary+",奖金:"+bonus)
}
}
import java.io.BufferedInputStreamimport java.io.BufferedOutputStream
import java.io.File
import java.io.FileInputStream
import java.io.FileNotFoundException
import java.io.FileOutputStream
import java.io.IOException
public class Test {
public static void main(String[] args) {
BufferedOutputStream out = null
try {
out = new BufferedOutputStream(new FileOutputStream(new File("d:/info.txt")))
String line = "第一行文本\n第二行文本"
out.write(line.getBytes())
} catch (FileNotFoundException e) {
e.printStackTrace()
} catch (IOException e) {
e.printStackTrace()
} finally {
if (out != null) {
try {
out.close()
} catch (IOException e) {
e.printStackTrace()
}
}
}
BufferedInputStream in = null
try {
in = new BufferedInputStream(new FileInputStream("d:/info.txt"))
StringBuffer buffer = new StringBuffer()
byte[] buff = new byte[in.available()]
while (in.read(buff) != -1) {
buffer.append(new String(buff))
}
System.out.println(buffer)
} catch (FileNotFoundException e) {
e.printStackTrace()
} catch (IOException e) {
e.printStackTrace()
} finally {
if (in != null) {
try {
in.close()
in = null
} catch (IOException e) {
e.printStackTrace()
}
}
}
}
}
