/**
 * project_name: Test
 * package_name: csdn_Test_20071126
 * package_declaration: package csdn_Test_20071126;
 * filename: VertorChangeTest.java
 * author: yuhaiming
 * date: 2007-11-30
 */
package csdn_Test_20071126;
import java.util.*;
public class VertorChangeTest {
    /**
     * 打印出来
     * @param vec
     */
    public static void display(Vector vec){
        for(int i=0;i<vec.size();i++){
            Vector curvec = (Vector)vec.elementAt(i);
            for(int j=0;j<curvec.size();j++){
                System.out.print(curvec.elementAt(j)+"  ");
            }
            System.out.println("");
        }
    }
    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
          Vector total= new Vector();
          initVector(total);
          display(total);
          total =  changeVector(total);
          display(total);
    }
    /**
     * 改变向量位置
     * @param total
     */
    public static Vector changeVector(Vector total){
        Vector result = new Vector();
        int row = total.size();//得到行数
        if(total.size()>0){
            Vector curvec = (Vector)total.get(0);
            int col = curvec.size();//得到列数
            System.out.println("行数："+row+"列数:"+col);
            
            //交换是将行数列数对换
            //第一次循环是得到原来向量列数数量的向量，也就是说原来有4列的话，将得到4个向量    
            for(int i=0;i<col;i++){
                //初始一个对象，这个对象将放到结果集中
                Vector curvector = new Vector();
                //第二次循环，是对该对象赋值，赋值的数量是原来的行数
                
                for(int j=0;j<row;j++){
                    curvec = (Vector)total.elementAt(j);
                    String value = (String)curvec.elementAt(i);//得到该列上的值
                    curvector.addElement(value);
                }
                result.addElement(curvector);
            }
        }else{
            System.out.println("元素太少");
        }
        return result;

    }
    /**
     * 初始化元素
     * @param total
     * @param ele
     */
    public static void initVector(Vector total){
        for(int i=0;i<4;i++){
            Vector curvector = new Vector();
            for(int j=0;j<3;j++){
                //System.out.println("a"+i+j);
                curvector.addElement("a"+i+j);
            }
            total.addElement(curvector);
        }        
    }

}

public Vector change(Vector v) {
    if (v.size() == 0) return new Vector();
    Vector tv = (Vector)v.get(0); 
    int colLen = tv.size(); //假设原来列是等长的，否则应该取最长的

    Vector col = new Vector[colLen];
    for (int i=0; i<col.length; i++) {
        col = new Vector();
    }

    for (int i=0; i<v.size(); i++) {
        tv = (Vector)v.get(i);
        for (int j=0; j<tv.size(); j++) {
            col[j].addElement(tv.get(j));
        }
    }

    Vector rst = new Vector();
    for (int i=0; i<col.length; i++) {
        rst.addElement(col[i]);
    }

    return rst;
}

public Vector change(Vector v) {
    if (v.size() == 0) return new Vector();
    Vector tv; // = (Vector)v.get(0);
    //int colLen = tv.size(); //假设原来列是等长的，否则应该取最长的 
    int maxLen = 0;
    for (int i=0; i<v.size(); i++) {
        tv = (Vector)v.get(i);
        if (tv.size()>max) max = tv.size();
    }

    Vector col = new Vector[maxLen];
    for (int i=0; i<col.length; i++) {
        col = new Vector();
    }

    for (int i=0; i<v.size(); i++) {
        tv = (Vector)v.get(i);
        for (int j=0; j<tv.size(); j++) {
            col[j].addElement(tv.get(j));
        }
        for (int j=tv.size(); j<maxLen; j++) {
            col[j].addElement(""); //这里要补齐
        }
    }

    Vector rst = new Vector();
    for (int i=0; i<col.length; i++) {
        rst.addElement(col[i]);
    }

    return rst;
}