blocks|key|870062|text|随机RGB值的一行代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|870063|new+Color((int)(Math.random()+*+0x1000000))|code-block|syntax|javascript|870064|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

A one-liner for random RGB values:

<pre><code>new Color((int)(Math.random() * 0x1000000))
</code></pre>

blocks|key|1084771|text|如果你想要令人愉悦的、柔和的颜色，最好使用HLS系统。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1084772|final+float+hue+=+random.nextFloat();
//+Saturation+between+0.1+and+0.3
final+float+saturation+=+(random.nextInt(2000)+%2B+1000)+/+10000f;
final+float+luminance+=+0.9f;
final+Color+color+=+Color.getHSBColor(hue,+saturation,+luminance);|code-block|syntax|javascript|1084773|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you want pleasing, pastel colors, it is best to use the HLS system.

<pre><code>final float hue = random.nextFloat();
// Saturation between 0.1 and 0.3
final float saturation = (random.nextInt(2000) + 1000) / 10000f;
final float luminance = 0.9f;
final Color color = Color.getHSBColor(hue, saturation, luminance);
</code></pre>

blocks|key|1084787|text|将此复制粘贴为鲜艳的柔和彩虹颜色|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1084788|int+R+=+(int)(Math.random()*256);
int+G+=+(int)(Math.random()*256);
int+B=+(int)(Math.random()*256);
Color+color+=+new+Color(R,+G,+B);+//random+color,+but+can+be+bright+or+dull

//to+get+rainbow,+pastel+colors
Random+random+=+new+Random();
final+float+hue+=+random.nextFloat();
final+float+saturation+=+0.9f;//1.0+for+brilliant,+0.0+for+dull
final+float+luminance+=+1.0f;+//1.0+for+brighter,+0.0+for+black
color+=+Color.getHSBColor(hue,+saturation,+luminance);|code-block|syntax|javascript|1084789|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Copy paste this for bright pastel rainbow colors 

<pre><code>int R = (int)(Math.random()*256);
int G = (int)(Math.random()*256);
int B= (int)(Math.random()*256);
Color color = new Color(R, G, B); //random color, but can be bright or dull

//to get rainbow, pastel colors
Random random = new Random();
final float hue = random.nextFloat();
final float saturation = 0.9f;//1.0 for brilliant, 0.0 for dull
final float luminance = 1.0f; //1.0 for brighter, 0.0 for black
color = Color.getHSBColor(hue, saturation, luminance);
</code></pre>

blocks|key|869827|text|如果你不想让它看起来很可怕，我建议在数组中定义一个颜色列表，然后使用随机数生成器来挑选一个。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|869828|如果你想要一个真正随机的颜色，你只需要生成3个从0到255的随机数，然后使用Color(int，int，int)构造函数来创建一个新的Color实例。|869829|Random+randomGenerator+=+new+Random();
int+red+=+randomGenerator.nextInt(256);
int+green+=+randomGenerator.nextInt(256);
int+blue+=+randomGenerator.nextInt(256);

Color+randomColour+=+new+Color(red,green,blue);|code-block|syntax|javascript|869830|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

If you don't want it to look horrible I'd suggest defining a list of colours in an array and then using a random number generator to pick one.

If you want a truly random colour you can just generate 3 random numbers from 0 to 255 and then use the Color(int,int,int) constructor to create a new Color instance.

<pre><code>Random randomGenerator = new Random();
int red = randomGenerator.nextInt(256);
int green = randomGenerator.nextInt(256);
int blue = randomGenerator.nextInt(256);

Color randomColour = new Color(red,green,blue);
</code></pre>

blocks|key|1084870|text|我知道现在回答这个问题有点晚了，但我还没见过其他人这么说。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1084871|正如Greg所说，您希望使用Random类|1084872|Random+rand+=+new+Random();|code-block|syntax|javascript|1084873|但我要说的区别很简单，你可以这样做：|1084874|Color+color+=+new+Color(rand.nextInt(0xFFFFFF));|1084875|就是这么简单！不需要生成许多不同的浮点数。|1084876|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

I know it's a bit late for this answer, but I've not seen anyone else put this.

Like Greg said, you want to use the Random class

<pre><code>Random rand = new Random();
</code></pre>

but the difference I'm going to say is simple do this:

<pre><code>Color color = new Color(rand.nextInt(0xFFFFFF));
</code></pre>

And it's as simple as that! no need to generate lots of different floats.

blocks|key|1084880|text|import+android.graphics.Color;

import+java.util.Random;

public+class+ColorDiagram+{
++++//+Member+variables+(properties+about+the+object)
++++public+String[]+mColors+=+{
++++++++++++"#39add1",+//+light+blue
++++++++++++"#3079ab",+//+dark+blue
++++++++++++"#c25975",+//+mauve
++++++++++++"#e15258",+//+red
++++++++++++"#f9845b",+//+orange
++++++++++++"#838cc7",+//+lavender
++++++++++++"#7d669e",+//+purple
++++++++++++"#53bbb4",+//+aqua
++++++++++++"#51b46d",+//+green
++++++++++++"#e0ab18",+//+mustard
++++++++++++"#637a91",+//+dark+gray
++++++++++++"#f092b0",+//+pink
++++++++++++"#b7c0c7"++//+light+gray
++++};

++++//+Method+(abilities:+things+the+object+can+do)
++++public+int+getColor()+{
++++++++String+color+=+"";

++++++++//+Randomly+select+a+fact
++++++++Random+randomGenerator+=+new+Random();+//+Construct+a+new+Random+number+generator
++++++++int+randomNumber+=+randomGenerator.nextInt(mColors.length);

++++++++color+=+mColors[randomNumber];
++++++++int+colorAsInt+=+Color.parseColor(color);

++++++++return+colorAsInt;
++++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1084881|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>import android.graphics.Color;

import java.util.Random;

public class ColorDiagram {
 // Member variables (properties about the object)
 public String[] mColors = {
 "#39add1", // light blue
 "#3079ab", // dark blue
 "#c25975", // mauve
 "#e15258", // red
 "#f9845b", // orange
 "#838cc7", // lavender
 "#7d669e", // purple
 "#53bbb4", // aqua
 "#51b46d", // green
 "#e0ab18", // mustard
 "#637a91", // dark gray
 "#f092b0", // pink
 "#b7c0c7" // light gray
 };

 // Method (abilities: things the object can do)
 public int getColor() {
 String color = "";

 // Randomly select a fact
 Random randomGenerator = new Random(); // Construct a new Random number generator
 int randomNumber = randomGenerator.nextInt(mColors.length);

 color = mColors[randomNumber];
 int colorAsInt = Color.parseColor(color);

 return colorAsInt;
 }
}
</code></pre>

blocks|key|869901|text|可以使用三个浮点数(r，g，b)实例化颜色，每个浮点数都在0.0和1.0之间：http://download.oracle.com/javase/6/docs/api/java/awt/Color.html#Color(float,%2520float,%2520float。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|869902|使用Java的Random类，您可以轻松地实例化新的随机颜色，如下所示：|869903|Random+r+=+new+Random();
Color+randomColor+=+new+Color(r.nextFloat(),+r.nextFloat(),+r.nextFloat());|code-block|syntax|javascript|869904|我不能保证它们都是漂亮的，但它们将是随机的=)|869905|entityMap|0|LINK|mutability|MUTABLE|url|http://download.oracle.com/javase/6/docs/api/java/awt/Color.html#Color(float,%2520float,%2520float)^0|13|2M|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|6|7|Y|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|Z|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|10|8|@]|9|@]|C|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

You can instantiate a color with three floats (r, g, b), each between 0.0 and 1.0: <a href="http://download.oracle.com/javase/6/docs/api/java/awt/Color.html#Color(float,%20float,%20float" rel="nofollow">http://download.oracle.com/javase/6/docs/api/java/awt/Color.html#Color(float,%20float,%20float</a>).

Using Java's Random class you can easily instantiate a new random color as such:

<pre><code>Random r = new Random();
Color randomColor = new Color(r.nextFloat(), r.nextFloat(), r.nextFloat());
</code></pre>

I can't guarantee they'll all be pretty, but they'll be random =)

blocks|key|1084706|text|好的。只需使用随机RGB值生成颜色即可。像这样：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1084707|public+Color+randomColor()
{
++Random+random=new+Random();+//+Probably+really+put+this+somewhere+where+it+gets+executed+only+once
++int+red=random.nextInt(256);
++int+green=random.nextInt(256);
++int+blue=random.nextInt(256);
++return+new+Color(red,+green,+blue);
}|code-block|syntax|javascript|1084708|如果你不喜欢随机数产生的颜色，你可能想改变随机数的生成。我猜这些会变得相当暗。|1084709|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Sure. Just generate a color using random RGB values. Like:

<pre><code>public Color randomColor()
{
 Random random=new Random(); // Probably really put this somewhere where it gets executed only once
 int red=random.nextInt(256);
 int green=random.nextInt(256);
 int blue=random.nextInt(256);
 return new Color(red, green, blue);
}
</code></pre>

You might want to vary up the generation of the random numbers if you don't like the colors it comes up with. I'd guess these will tend to be fairly dark.

blocks|key|1084740|text|你似乎想要浅色随机的颜色。不知道你说的光到底是什么意思。但是如果你想要随机的“彩虹色”，试试这个|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1084741|Random+r+=+new+Random();
Color+c+=+Color.getHSBColor(r.nextFloat(),//random+hue,+color
++++++++++++++++1.0,//full+saturation,+1.0+for+'colorful'+colors,+0.0+for+grey
++++++++++++++++1.0+//1.0+for+bright,+0.0+for+black
++++++++++++++++);|code-block|syntax|javascript|1084742|有关更多信息，请搜索HSB颜色模型。|1084743|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

You seem to want light random colors. Not sure what you mean exactly with light. But if you want random 'rainbow colors', try this

<pre><code>Random r = new Random();
Color c = Color.getHSBColor(r.nextFloat(),//random hue, color
 1.0,//full saturation, 1.0 for 'colorful' colors, 0.0 for grey
 1.0 //1.0 for bright, 0.0 for black
 );
</code></pre>

Search for HSB color model for more information.

blocks|key|870047|text|package+com.adil.util;

/**
*+The+Class+RandomColor.
*
*+@author+Adil+OUIDAD
*+@URL+:+http://kizana.fr
*/
public+class+RandomColor+{++++++
++++/**
++++*+Gets+the+random+color.
++++*
++++*+@return+the+random+color
++++*/
++++public+static+String+getRandomColor()+{
+++++++++String[]+letters+=+{"0","1","2","3","4","5","6","7","8","9","A","B","C","D","E","F"};
+++++++++String+color+=+"#";
+++++++++for+(int+i+=+0;+i+<+6;+i%2B%2B+)+{
++++++++++++color+%2B=+letters[(int)+Math.round(Math.random()+*+15)];
+++++++++}
+++++++++return+color;
++++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|870048|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>package com.adil.util;

/**
* The Class RandomColor.
*
* @author Adil OUIDAD
* @URL : http://kizana.fr
*/
public class RandomColor { 
 /**
 * Gets the random color.
 *
 * @return the random color
 */
 public static String getRandomColor() {
 String[] letters = {"0","1","2","3","4","5","6","7","8","9","A","B","C","D","E","F"};
 String color = "#";
 for (int i = 0; i &lt; 6; i++ ) {
 color += letters[(int) Math.round(Math.random() * 15)];
 }
 return color;
 }
}
</code></pre>

I want to draw random coloured points on a JPanel in a Java application. Is there any method to create random colours?

Creating random colour in Java?

Java

我想在Java应用程序中的JPanel上随机绘制彩色点。有没有什么方法可以创建随机颜色？

问在Java中创建随机颜色？
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回答 10

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