java基础编程求解.
import java.util.Scanner;
/*
* @author ww
*
*/
public class Test {
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
System.out.println("输入一个正整数n(n>=2)");
int n = s.nextInt();
StringBuilder sb = new StringBuilder();
boolean has = false;
for(int i=1;i<n;i++){
int temp = i;
sb.append(i).append(" ");
for(int j=i+1;j<n;j++){
temp += j;
sb.append(j).append(" ");
if(temp==n){
System.out.println(sb.toString());
has = true;
}
}
sb.delete(0, sb.length());
}
if(!has){
System.out.println("NONE");
}
}
}
3.
String str1=new String("TestString1");
String str2=new String("TestString2");
System.out.println(str1.length());//字符串长度
System.out.println(str1.equals(str2));//字符串比较
System.out.println(str1.charAt(2));//查找索引2的字符
System.out.println(str1.matches("Test"));//模式比配，是否包含Test
System.out.println(str1.substring(2, 5));//截取子串
System.out.println(str1.replace("T", "G"));//将T替换成G
System.out.println(str1.toLowerCase());//转换成小写
System.out.println(str1.toUpperCase());//转换成大写
System.out.println(str1.concat(str2));//将str2添加到str1的尾部
4.
public class Test
{
public static void main(String []args)
{
String str1="1.23456e2";
String str2="87.8f";
String str3="128";
double d=Double.parseDouble(str1);
float f=Float.parseFloat(str2);
int i=Integer.parseInt(str3);
double sum=d+f+i;
System.out.println(String.format("%.2f", sum));
}
}
import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.Scanner;
import java.util.Collections;
//学生类
class stuScore {
private String name;
private String yuwen;
private String shuxue;
private String yingyu;
private String sumScore;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getYuwen() {
return yuwen;
}
public void setYuwen(String yuwen) {
this.yuwen = yuwen;
}
public String getShuxue() {
return shuxue;
}
public void setShuxue(String shuxue) {
this.shuxue = shuxue;
}
public String getYingyu() {
return yingyu;
}
public void setYingyu(String yingyu) {
this.yingyu = yingyu;
}
public String getSumScore() {
return sumScore;
}
public void setSumScore(String sumScore) {
this.sumScore = sumScore;
}
}
//处理分数
class DealScore {
//计算总分数
public void calSumScore(List<stuScore> stulist){
for(int i=0;i<stulist.size();i++){
stulist.get(i).setSumScore(String.valueOf((Integer.parseInt(stulist.get(i).getYuwen())+Integer.parseInt(stulist.get(i).getShuxue())
+Integer.parseInt(stulist.get(i).getYingyu()))));
}
}
//输出分数
public void printScore(List<stuScore> stulist){
System.out.println("-------------学生成绩表-----------------");
System.out.println("姓名 语文 数学 英语 总分 名次");
for(int i=0;i<stulist.size();i++){
System.out.print(stulist.get(i).getName()+" ");
System.out.print(stulist.get(i).getYuwen()+" ");
System.out.print(stulist.get(i).getShuxue()+" ");
System.out.print(stulist.get(i).getYingyu()+" ");
System.out.print(stulist.get(i).getSumScore()+" ");
System.out.println(stulist.size()-i);
}
System.out.println("---------------------------------------");
}
}
//比较器
class ComparatorStuScore implements Comparator{
public int compare(Object o1, Object o2) {
// TODO Auto-generated method stub
stuScore stu1=(stuScore)o1;
stuScore stu2=(stuScore)o2;
int flag=stu1.getSumScore().compareTo(stu2.getSumScore());
return flag;
}
}
//测试类
public class testStudentScore {
@SuppressWarnings("unchecked")
public static void main(String[] args){
List<stuScore> stulist=new ArrayList<stuScore>();
Scanner scan=new Scanner(System.in);
stuScore stu=new stuScore();
System.out.println("请输入学生信息（姓名 语文 数学 英语）：");
stu.setName(scan.nextLine());
stu.setYuwen(scan.nextLine());
stu.setShuxue(scan.nextLine());
stu.setYingyu(scan.nextLine());
stulist.add(stu);
while(true){
System.out.println("继续输入吗？y/n");
stuScore stu1=new stuScore();
String iflag=scan.nextLine();
if(iflag.equals("y")){
stu1.setName(scan.nextLine());
stu1.setYuwen(scan.nextLine());
stu1.setShuxue(scan.nextLine());
stu1.setYingyu(scan.nextLine());
stulist.add(stu1);
}else{
break;
}
}
ComparatorStuScore css=new ComparatorStuScore();
DealScore ds=new DealScore();
ds.calSumScore(stulist);
Collections.sort(stulist,css);
ds.printScore(stulist);
}
}
//添加5个人的成绩
String sql1 = "insert into 学生表成绩表 values(xx, xx, xx, xx, xx)";
//降序排名
String sql2 = "select * from 学生成绩表 order by 名次";
你这80分我还真不想动 200分还差不多 这得好长一段代码 懒得敲 自己百度啊 这里面主要都是面向对象的基础知识
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