Eclipse传递main函数参数，main函数参数

main(String args[]) args数组为存储命令行传递进去的参数，如下例子

package findfile;import java.io.File;import java.util.ArrayList;public class FindFile{ public  ArrayList<String>  fileList  =  new  ArrayList<String>();       // 在pathName文件夹下查找文件名为fileName的文件,结果存入fileListpublic void  findFiles( String pathName, String fileName){File f=new File( pathName );if( !f.isDirectory() || fileName.equals(""))  return;File [] subFiles = f.listFiles();            if( subFiles==null ) return;for(int  i=0; i<subFiles.length;  i++){if( subFiles[i].isFile() ) {      if( subFiles[i].getName().equalsIgnoreCase(fileName) )         fileList.add( subFiles[i].getPath() );    } else  findFiles( subFiles[i].getPath(), fileName );}}/*public static void main( String [] args){FindFile ff= new FindFile();ff.findFiles("D://ttt", "student1.txt");for(int  i=0; i<ff.fileList.size(); i++)      System.out.println( ff.fileList.get(i));}*/}

import java.util.Scanner;import java.io.*;import findfile.*;public class TestIO{public static void main(String []args){String dirName, fileName;if( args.length<2 ) return;dirName=args[0];fileName=args[1];FindFile ff= new FindFile();    ff.findFiles(dirName, fileName);    if( ff.fileList.size()>0)    try  {            Scanner  sc = new Scanner( new FileInputStream(ff.fileList.get(0).toString()));        String name, id;    Student studentList[ ] = new Student[ 100 ];    float math, chi;    int i=0;    while( sc.hasNext())    {       name=sc.next();    id = sc.next();    math = sc.nextFloat();    chi= sc.nextFloat();    studentList[i]=new Student( name, id, math, chi);    studentList[i].calTotal();    studentList[i].calAverage();i++;        }    int n=i;    Student.sort(studentList ,n );    for( i=0; i< n; i++)         System.out.printf("%10s%15s%10.2f%10.2f%10.2f%10.2f/n",                studentList[i].name, studentList[i].id,studentList[i].math,                studentList[i].chi, studentList[i].average, studentList[i].total);        }catch( IOException e){    e.printStackTrace();    }    System.exit(0); }}class Student{String name, id;float math, chi, average, total;public Student(String name, String id, float math, float chi){this.name=name;this.id=id;this.math=math;this.chi=chi;}public void calTotal(){total=math+chi;}public void calAverage(){average=(math+chi)/2;}public static void sort( Student st[], int n){int i,j,k;Student temp;for( i=0; i<n-1; i++){k=i;for(j=i+1; j<n; j++)    if( st[j].total>st[k].total ) k=j;if( k!=i){temp=st[k];    st[k]=st[i];    st[i]=temp;}}}}

在项目上右击 Run As->Run Configurations...->Arguments->在Program arguments：的文本框中输入你要传入的参数,若有几个参数则在参数间空格就行。然后点击Run按钮。

例如有两个参数：args[0]和args[1]分别为文件路劲和文件名称D:/java   student.txt(student.txt为欲读取的文件)

只需在Arguments中输入D:/java   student.txt即可