誰能給我解釋下java中三目運(yùn)算符從右向左運(yùn)算到底是什么意思？

是說有多個(gè)三目運(yùn)算符在一個(gè)表達(dá)式里的時(shí)候，從右向左執(zhí)行

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a b ? b c ? 1 : 0 : 2會(huì)先執(zhí)行b c ? 1 : 0

寫一個(gè)java程序 將一首古詩豎著排序從右往左讀

import java.awt.Color;

import java.awt.Font;

import java.awt.GradientPaint;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.Image;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import java.awt.geom.AffineTransform;

import java.awt.image.AffineTransformOp;

import java.awt.image.BufferedImage;

import java.io.BufferedReader;

import java.io.StringReader;

import java.util.ArrayList;

import javax.swing.JFrame;

import javax.swing.JLabel;

public class PoetryTest {

public static void main(String[] args) throws Exception {

final JFrame f = new JFrame();

final ArrayListPoetry ps = PContents.load();

final PoetryLabel plabel = new PoetryLabel();

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

f.add(plabel);

f.setSize(320,268);

f.setLocationRelativeTo(null);

f.setVisible(true);

plabel.setPoetry(ps.get(0));

f.setTitle(plabel.getTitle()+"-"+plabel.getAuthor());

plabel.addMouseListener(new MouseAdapter(){

int index;

public void mouseClicked(MouseEvent e){

++index;

index=index%ps.size();

Poetry p = ps.get(index);

plabel.setPoetry(p);

f.setTitle(plabel.getTitle()+"-"+plabel.getAuthor());

}

});

}

}

//呈現(xiàn)詩歌的標(biāo)簽類

class PoetryLabel extends JLabel{

private static final Color tColor = Color.white;//標(biāo)題顏色

private static final Color aColor = Color.yellow;//作者顏色

private static final Color cColor = Color.LIGHT_GRAY;//內(nèi)容顏色

private static final int fontSize=16;//字體大小

private static final int tType = Font.BOLD;//標(biāo)題字體樣式為粗體

private static final int aType = Font.ITALIC;//作者字體樣式為斜體

private static final int cType = Font.PLAIN;//內(nèi)容字體樣式為普通樣式

private static final float scaleFactor = 1.2f;//標(biāo)題字體大小比其它字體大

private static final String fontName="SimSun";//字體名稱

private static final int offset=5,space=5;

private Font font;

private AffineTransform at;

private Poetry poem;

public PoetryLabel(){

this.poem=new Poetry();

this.font=new Font(fontName,cType,fontSize);

this.setHorizontalAlignment(JLabel.CENTER);

this.setVerticalAlignment(JLabel.CENTER);

at = new AffineTransform();

at.setToRotation(Math.toRadians(-90));

font = font.deriveFont(at);//將字體逆時(shí)針旋轉(zhuǎn)90°

}

public Poetry getPoetry() {

return poem;

}

//設(shè)置詩歌,來初始化標(biāo)簽內(nèi)容

public void setPoetry(Poetry s){

this.poem=s;

this.repaint();

}

public String getTitle(){return poem.title;}

public String getAuthor(){return poem.author;}

//創(chuàng)建圖像,先將逆時(shí)針旋轉(zhuǎn)了90°的文件畫上,然后將整幅圖像順時(shí)針旋轉(zhuǎn)90°

private Image createImage(){

int x;

int y=offset;

int w = getTWidth(poem);

int h = getTHeight(poem);

BufferedImage img = new BufferedImage(w,h,BufferedImage.TYPE_INT_ARGB);

Graphics2D g = img.createGraphics();

//draw title

g.setColor(tColor);

Font tfont = font.deriveFont(font.getSize()*scaleFactor).deriveFont(tType);

g.setFont(tfont);

y+=tfont.getSize();

char[] cs = poem.title.toCharArray();

for(int i=0; ics.length; i++){

x=(i+1)*(tfont.getSize()+space)+offset;

g.drawChars(cs, i, 1, x, y);

}

//draw author

y+=space*2+tfont.getSize();

cs = poem.author.toCharArray();

tfont = font.deriveFont(aType);

g.setColor(aColor);

g.setFont(tfont);

for(int i=0; ics.length; i++){

x=(i+1)*(tfont.getSize()+space)+offset;

g.drawChars(cs, i, 1, x, y);

}

//draw contents

y+=space*3;

g.setColor(cColor);

g.setFont(font);

for(int i=0; ipoem.contents.size(); i++){

y+=fontSize+space;

cs = poem.contents.get(i).toCharArray();

for(int j=0; jcs.length; j++){

x=(j+1)*(tfont.getSize()+space)+offset;

g.drawChars(cs, j, 1, x, y);

}

}

g.dispose();

return this.getRotateImage(img);

}

//將圖像順時(shí)針旋轉(zhuǎn)90°

private Image getRotateImage(final BufferedImage img) {

int w = img.getWidth();

int h = img.getHeight();

BufferedImage newImg = new BufferedImage(h,w,2);

AffineTransformOp op = new AffineTransformOp(AffineTransform.

getRotateInstance(Math.toRadians(90),h/2,h/2),null);

return op.filter(img,newImg);

}

//繪圖

public void paint(Graphics gg){

BufferedImage img = (BufferedImage)this.createImage();

int iw = img.getWidth();

int ih = img.getHeight();

Graphics2D g = (Graphics2D)gg;

int w = this.getWidth();

int h = this.getHeight();

g.setPaint(new GradientPaint(0,0,Color.DARK_GRAY,0,h,Color.black));

g.fillRect(0,0,w,h);

int x = (w-iw)/2;

int y = (h-ih)/2;

g.drawImage(img, x, y, this);

g.dispose();

}

//計(jì)算圖片的高度

private int getTHeight(Poetry s) {

int h = offset*2+space*5;

h+=(int)(fontSize*(scaleFactor+1));

h+=(fontSize+space*2)*s.contents.size();

return h;

}

//計(jì)算圖片的寬度

private int getTWidth(Poetry s) {

int tl = (int)(s.title.length()*(fontSize*scaleFactor+space)+offset*2);

int al = s.author.length()*(fontSize+space)+offset*2;

int t;

int max = tlal?tl:al;

for(int i=0; is.contents.size(); i++){

t = s.contents.get(i).length()*(fontSize+space)+offset*2;

max=maxt?max:t;

}

return max;

}

}

//詩歌類

class Poetry{

public String title;//標(biāo)題

public String author;//作者

public ArrayListString contents=new ArrayListString();//內(nèi)容

public void addLine(String s){this.contents.add(s);}//加入一行內(nèi)容

}

//

class PContents{

public static String s=

"蘇武廟\r\n"+

"溫庭筠\r\n"+

"蘇武魂銷漢使前，\r\n"+

"古祠高樹兩茫然。\r\n"+

"云邊雁斷胡天月，\r\n"+

"隴上羊歸塞草煙。\r\n"+

"回日樓臺(tái)非甲帳，\r\n"+

"去時(shí)冠劍是丁年。\r\n"+

"茂陵不見封侯印，\r\n"+

"空向秋波哭逝川。\r\n"+

"\r\n"+

"貧女\r\n"+

"秦韜玉\r\n"+

"蓬門未識(shí)綺羅香，\r\n"+

"擬托良媒益自傷。\r\n"+

"誰愛風(fēng)流高格調(diào)？\r\n"+

"共憐時(shí)世儉梳妝。\r\n"+

"敢將十指夸針巧，\r\n"+

"不把雙眉斗畫長。\r\n"+

"苦恨年年壓金線，\r\n"+

"為他人作嫁衣裳。\r\n"+

"\r\n"+

"宮詞\r\n"+

"薛逢\r\n"+

"十二樓中盡曉妝，\r\n"+

"望仙樓上望君王。\r\n"+

"鎖銜金獸連環(huán)冷，\r\n"+

"水滴銅龍晝漏長。\r\n"+

"云髻罷梳還對(duì)鏡，\r\n"+

"羅衣欲換更添香。\r\n"+

"遙窺正殿簾開處，\r\n"+

"袍褲宮人掃御床。\r\n"+

"\r\n"+

"利洲南渡\r\n"+

"溫庭筠\r\n"+

"澹然空水對(duì)斜暉，\r\n"+

"曲島蒼茫接翠微。\r\n"+

"波上馬嘶看棹去，\r\n"+

"柳邊人歇待船歸。\r\n"+

"數(shù)叢沙草群鷗散，\r\n"+

"萬頃江田一鷺飛。\r\n"+

"誰解乘舟尋范蠡，\r\n"+

"五湖煙水獨(dú)忘機(jī)？\r\n"+

"\r\n"+

"無題二首之一\r\n"+

"李商隱\r\n"+

"鳳尾香羅薄幾重，\r\n"+

"碧文圓頂夜深縫。\r\n"+

"扇裁月魄羞難掩，\r\n"+

"車走雷聲語未通。\r\n"+

"曾是寂寥金燼暗，\r\n"+

"斷無消息石榴紅。\r\n"+

"斑騅只系垂楊岸，\r\n"+

"何處西南任好風(fēng)？\r\n"+

"\r\n"+

"無題二首之二\r\n"+

"李商隱\r\n"+

"重帷深下莫愁堂，\r\n"+

"臥后清宵細(xì)細(xì)長。\r\n"+

"神女生涯原是夢(mèng)，\r\n"+

"小姑居處本無郎。\r\n"+

"風(fēng)波不信菱枝弱，\r\n"+

"月露誰教桂葉香？\r\n"+

"直道相思了無益，\r\n"+

"未妨惆悵是清狂。\r\n"+

"\r\n"+

"金陵圖\r\n"+

"韋莊\r\n"+

"江雨霏霏江草齊，\r\n"+

"六朝如夢(mèng)鳥空啼。\r\n"+

"無情最是臺(tái)城柳，\r\n"+

"依舊煙籠十里堤。\r\n" +

"\r\n"

;

public static ArrayListPoetry load() throws Exception{

ArrayListPoetry list = new ArrayListPoetry();

BufferedReader br = new BufferedReader(new StringReader(s));

Poetry p = null;

String t = null;

while((t = br.readLine()) != null){

if(p==null)

p=new Poetry();

if(t.isEmpty()){

list.add(p);

p=null;

}

else if(p.title==null)

p.title=t;

else if(p.author==null)

p.author=t;

else

p.addLine(t);

}

return list;

}

}

java 從右往左截取如何截取。

/*?字符串串從右往左截取?

*?思路：

*? 讓字符串倒序，然后再截取

*?*/

public?static?String?spiltRtoL(String?s){

StringBuffer?sb?=?new?StringBuffer();

int?length?=?s.length();

char[]?c?=?new?char[length];

for?(int?i?=?0;?i??length;?i++)?{

c[i]?=?s.charAt(i);

}

for?(int?i?=?length?-?1;?i?=?0;?i--)?{

sb.append(c[i]);

}

return?sb.toString();

}

Java中正則表達(dá)式如何實(shí)現(xiàn)從右往左匹配？

你的左右沒分清楚

如果不用正則表達(dá)式，就用int i = str.lastIndexOf("/n");能找出位置來

如果用正則表達(dá)式，就用"(/n)(?=(^/n)*)"意思就是匹配后面再?zèng)]有/n的/n

本文名稱：java古詩代碼從右到左 java從左到右取數(shù)字
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