1. 从java中调用weka中的分类函数的问题
详细咐轮乱请见：http://stackoverflow.com/questions/8112041/error-while-using-weka-api-in-java-code-class-attribute-not-set
你应桐正该在这行 Instances instances = getArffData("E:\\Book2.arff"); // 读衡档入文件
后加入一条语句： instances.setClassIndex(instances.numAttributes() - 1);
You should set class index of for your dataset before passing it into classifier. Your classifier must know which is your outcome variable.
//Rest of your code
loader.setQuery("select * from data_training"); Instances data = loader.getDataSet(); //add this line here
data.setClassIndex(instances.numAttributes() - 1);
//if Hujan is your class attribute(outcome variable)
2. java 将字符串中含有unicode 转成中文！
publicclassConvert
{
(Stringasciicode)
{
String[]asciis=asciicode.split("\\u");
StringnativeValue=asciis[0];
try
{
for(inti=1;i<asciis.length;i++)
{
Stringcode=asciis[i];
nativeValue+=(char)Integer.parseInt(code.substring(0,4),16);
if(code.length()>4)
{
nativeValue+=code.substring(4,code.length());
}
}
}
catch(NumberFormatExceptione)
{
returnasciicode;
}
returnnativeValue;
}
publicstaticvoidmain(String[]args)
{
Stringstr=""JWHQK_JWQC":""";
Stringresult=ascii2native(str);
System.out.println(result);
}
}
3. 缂栦竴涓 java 灏忕▼搴 镐ユ眰 镐ユユユユユユ
import java.io.*;
public class Test
{
public static void main(String arg[])throws IOException{
int a=0;
int b=0;
int c=0;
int d=0;
int f=0;
int n=0;
System.out.println("璇疯緭鍏ユ垚缁,鎸夊洖杞︾‘瀹,鎴愮哗杈揿叆瀹屾垚钖,杈揿叆F鎴杅镆ョ湅缁撴灉.");
for(;;n++)
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
String s=br.readLine();
if (s.equals("F")||s.equals("f")) break;
int i=Integer.parseInt(s);
if(i>100||i<0){System.out.println("杈揿叆链夐敊璇锛佽烽吨鏂拌緭鍏!");n--; }
else
if (i>=85 && i<=100) {a++;}
if (i>=70 && i<85) {b++;}
if (i>=55 && i<70) {c++;}
if (i>=45 && i<55) {d++;}
if (i>=0 && i<45) {f++;}
}
System.out.println("鍏辫緭鍏"+ n + "涓瀛︾敓镄勬垚缁" + "\n"+
"绛夌骇A镄勫︾敓链"+ a + "涓" + "\n" +
"绛夌骇B镄勫︾敓链"+ b + "涓" + "\n" +
"绛夌骇C镄勫︾敓链"+ c + "涓" + "\n" +
"绛夌骇D镄勫︾敓链"+ d + "涓" + "\n" +
"绛夌骇F镄勫︾敓链"+ f + "涓");}
}