java 练习

 

 

import java.io.*;
public class  CharCounter{
	private int[] charcount = new int[26];
	Chart chart;
	public CharCounter(String filename){
		BufferedReader br = null;
		try{
			 br = new BufferedReader(new FileReader(filename));
			 String str=null;
			 while((str=br.readLine())!=null){
				str=str.toUpperCase();
				for(int i =0,length = str.length();i<length;i++){
					char ch = str.charAt(i);
					int index = ch-'A';		 //A-0,B-1....
					if(index>=0 && index <= 25)charcount[index]++;
				}
			 }
			 br.close();
			 chart = new Chart(new String[]{"A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"},charcount,"*");
		}catch(Exception e){
			e.printStackTrace();
		}
	}
	public void plainOut(){
		chart.plainOut();
	}
	public void horizontalOut(){
		chart.horizontalOut();
	}
	public void verticalOut(){
		chart.verticalOut();
	}
	public static void main(String[] args){
	     // new CharCounter("input.txt").horizontalOut();
		  new CharCounter("input.txt").verticalOut();
			//new CharCounter("input.txt").plainOut();

	}
}

class Chart{
	private String[] label;
	private int[] data;
	private String style;
	private RotateArray ra ;
	public Chart(String[] label,int[] data,String style){
		this.label = label;
		this.data = data;
		this.style = style;
		fillData();
	}
	public void fillData(){
		int max = max(data);
		String[][] str = new String[data.length][max+2];
		for(int i =0,len = data.length;i<len;i++){
			
			for(int j =0;j< max+2;j++){
				if(j>0&& j<data[i])str[i][j] = style;
				else str[i][j] = " ";
			}
			str[i][0] = label[i];
			str[i][max+1] = ""+data[i];
		}
		ra = new RotateArray(str);
	}
	public static String multi(String s,int rate){
		String str ="" ;
		for(int i =0;i<rate;i++){
			str+=s;
		}
		return str;
	}
	public static int max(int[] data){
		int max = data[0];
		for(int i =1,len = data.length;i<len;i++){
			if(max<data[i])max=data[i];
		}
		return max;
	}
	public void plainOut(){
		for(int i =0;i<label.length;i++){
			System.out.println(label[i]+":"+data[i]);
		}
	
	}
	public void horizontalOut(){
		out(ra.get());
	}
	public void verticalOut(){
		out(ra.rotate(-1).get());
	}
	public void out(String[][] a){
			for(int i =0;i<a.length;i++){
				for(int j =0;j<a[i].length;j++){
					System.out.print(a[i][j]+multi(" ",1));
				}
				System.out.println();
			}
	}

}

class RotateArray{
	private String[][] original ;
	private String[][] rotatedArray ;
	public RotateArray(String[][] a){
		this.original = a;
	}
	public RotateArray rotate(int rate){  
		for(int i =0,len =rate>=0? rate%4:rate%4+4;i<len;i++){
			rotate();
		}
		return this;
	}
	public RotateArray rotate(){
		int rows = rotatedArray==null?original[0].length:rotatedArray[0].length;
		int cols = rotatedArray==null?original.length:rotatedArray.length;
		String[][] temp = new String[rows][cols];
			for(int i =0,len = temp.length;i<len;i++){
				for(int j =0,len2 = temp[i].length;j<len2;j++){
					if(rotatedArray!=null)temp[i][j] = rotatedArray[len2-1-j][i];
					else temp[i][j] = original[len2-1-j][i];
				}
			}
		rotatedArray = temp;
		return this;
	}
	public String[][] get(){
		return rotatedArray!=null?rotatedArray:original;
	}
}