关于怎样使用(系统类)的问题 急待弄java语言来编写这个程序:(从键盘输入学生姓名和Java成绩,当学生姓名为end时结束输入。统计并输出学生人数、最高分、最低分和平均成绩,并将所有输入保存到文件javagrade.txt中。)!!希望高手能帮助解决,,--java初学者上 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 //大概写了一下,有什么BUG,自己动动手吧package csdn;import java.io.BufferedWriter;import java.io.FileWriter;import java.io.IOException;import java.io.PrintWriter;import java.util.Scanner; public class TestDefault { public static void main(String[] args) { PrintWriter pw = null; try { Scanner sc = new Scanner(System.in); System.out.println(" 请输入姓名和成绩!例如:赵龙 100.用end或者Enter键可以结束!"); String line = sc.nextLine(); int index = line.indexOf("end"); if(index !=-1) line = line.substring(0,index ); String[] data = line.split("\\s+"); if(data.length%2!=0) { System.out.println("你输入的格式不对!"); return; } Integer[] in = new Integer[data.length/2]; String[] name = new String[data.length/2]; for(int i=0;i<in.length;i++) { name[i] = data[i*2]; in[i] = Integer.valueOf(data[i*2+1]); } for(int i=0;i<in.length;i++) { for(int j=i+1;j<in.length;j++) { if(in[i]>in[j]) { int k = in[i]; in[i] = in[j]; in[j] = k; String s = name[i]; name[i] = name[j]; name[j] = s; } } } pw = new PrintWriter(new BufferedWriter(new FileWriter("D:\\javagrade.txt"))); for(int i=0;i<in.length;i++) { pw.write("姓名:"+name[i]+" 成绩:"+in[i]+"\r\n"); pw.flush(); } } catch (IOException e) { System.out.println("文件打开失败!"); }catch (Exception e1){ System.out.println("输入的数据有误!"); }finally { if(pw != null) pw.close(); } }} 好像没有统计并输出学生人数、最高分、最低分和平均成绩,,,只是保存到那个javagrade文件里啊!!求解 //都排序好了,你可以自己弄的!package csdn;import java.io.BufferedWriter;import java.io.FileWriter;import java.io.IOException;import java.io.PrintWriter;import java.util.Scanner; public class TestDefault { public static void main(String[] args) { PrintWriter pw = null; try { Scanner sc = new Scanner(System.in); System.out.println(" 请输入姓名和成绩!例如:赵龙 100.用end或者Enter键可以结束!"); String line = sc.nextLine(); int index = line.indexOf("end"); if(index !=-1) line = line.substring(0,index ); String[] data = line.split("\\s+"); if(data.length%2!=0) { System.out.println("你输入的格式不对!"); return; } Integer[] in = new Integer[data.length/2]; String[] name = new String[data.length/2]; for(int i=0;i<in.length;i++) { name[i] = data[i*2]; in[i] = Integer.valueOf(data[i*2+1]); } for(int i=0;i<in.length;i++) { for(int j=i+1;j<in.length;j++) { if(in[i]>in[j]) { int k = in[i]; in[i] = in[j]; in[j] = k; String s = name[i]; name[i] = name[j]; name[j] = s; } } } pw = new PrintWriter(new BufferedWriter(new FileWriter("D:\\javagrade.txt"))); float chengji = 0; for(int i=0;i<in.length;i++) { pw.write("姓名:"+name[i]+" 成绩:"+in[i]+"\r\n"); chengji+=in[i]; pw.flush(); } chengji = chengji/in.length; //写入平均成绩,最高成绩,最低成绩,学生人数! pw.println("平均成绩:"+chengji); pw.println("学生人数:"+in.length); pw.println("最高成绩:"+in[in.length-1]); pw.println("最低成绩:"+in[0]); } catch (IOException e) { System.out.println("文件打开失败!"); }catch (Exception e1){ System.out.println("输入的数据有误!"); }finally { if(pw != null) pw.close(); } }} 帮帮忙解决小问题,关于构造函数 利用jni 操作Java对象的属性 为什么不能获得对象成员 关于循环语句问题 怎样在B/S系统上在客户端自动打印 找女朋友....... 请教:JTable里面某一列加上JCheckBox后怎么成了单选框的效果? 如何监听jtree的点击事件 请问一个c语言定义的数在java中怎样正确识别? 在JB6的Swing组的jlabel的icon属性中,为什么无法选中已经添加到工程中的.gif图形文件? 如何每六位进行读写文件 急求java编程思想 补充材料 请教如何检验用户传入的类型是正确的?
//大概写了一下,有什么BUG,自己动动手吧
package csdn;import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Scanner; public class TestDefault {
public static void main(String[] args) {
PrintWriter pw = null;
try {
Scanner sc = new Scanner(System.in);
System.out.println(" 请输入姓名和成绩!例如:赵龙 100.用end或者Enter键可以结束!");
String line = sc.nextLine();
int index = line.indexOf("end");
if(index !=-1)
line = line.substring(0,index );
String[] data = line.split("\\s+");
if(data.length%2!=0) {
System.out.println("你输入的格式不对!");
return;
}
Integer[] in = new Integer[data.length/2];
String[] name = new String[data.length/2];
for(int i=0;i<in.length;i++) {
name[i] = data[i*2];
in[i] = Integer.valueOf(data[i*2+1]);
}
for(int i=0;i<in.length;i++) {
for(int j=i+1;j<in.length;j++) {
if(in[i]>in[j]) {
int k = in[i];
in[i] = in[j];
in[j] = k;
String s = name[i];
name[i] = name[j];
name[j] = s;
}
}
}
pw = new PrintWriter(new BufferedWriter(new FileWriter("D:\\javagrade.txt")));
for(int i=0;i<in.length;i++) {
pw.write("姓名:"+name[i]+" 成绩:"+in[i]+"\r\n");
pw.flush();
}
} catch (IOException e) {
System.out.println("文件打开失败!");
}catch (Exception e1){
System.out.println("输入的数据有误!");
}finally {
if(pw != null)
pw.close();
}
}
}
package csdn;import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Scanner; public class TestDefault {
public static void main(String[] args) {
PrintWriter pw = null;
try {
Scanner sc = new Scanner(System.in);
System.out.println(" 请输入姓名和成绩!例如:赵龙 100.用end或者Enter键可以结束!");
String line = sc.nextLine();
int index = line.indexOf("end");
if(index !=-1)
line = line.substring(0,index );
String[] data = line.split("\\s+");
if(data.length%2!=0) {
System.out.println("你输入的格式不对!");
return;
}
Integer[] in = new Integer[data.length/2];
String[] name = new String[data.length/2];
for(int i=0;i<in.length;i++) {
name[i] = data[i*2];
in[i] = Integer.valueOf(data[i*2+1]);
}
for(int i=0;i<in.length;i++) {
for(int j=i+1;j<in.length;j++) {
if(in[i]>in[j]) {
int k = in[i];
in[i] = in[j];
in[j] = k;
String s = name[i];
name[i] = name[j];
name[j] = s;
}
}
}
pw = new PrintWriter(new BufferedWriter(new FileWriter("D:\\javagrade.txt")));
float chengji = 0;
for(int i=0;i<in.length;i++) {
pw.write("姓名:"+name[i]+" 成绩:"+in[i]+"\r\n");
chengji+=in[i];
pw.flush();
}
chengji = chengji/in.length;
//写入平均成绩,最高成绩,最低成绩,学生人数!
pw.println("平均成绩:"+chengji);
pw.println("学生人数:"+in.length);
pw.println("最高成绩:"+in[in.length-1]);
pw.println("最低成绩:"+in[0]);
} catch (IOException e) {
System.out.println("文件打开失败!");
}catch (Exception e1){
System.out.println("输入的数据有误!");
}finally {
if(pw != null)
pw.close();
}
}
}