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<meta name="description" content="其实JAVA是在C和C++上开发的，因此他们很多东西是类似的。下面就是我学习的过程中觉得一些很重要的东西，写下来吧。 JAVA里面输出语句有两种。 System.out.print(“……”); 这一个就相当于C里面的printf(“……”); System.out.println(“…….”);这一个就相当于printf(“……\n”); 第一个使用命令行参数程序 public class ne">
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<meta property="og:description" content="其实JAVA是在C和C++上开发的，因此他们很多东西是类似的。下面就是我学习的过程中觉得一些很重要的东西，写下来吧。 JAVA里面输出语句有两种。 System.out.print(“……”); 这一个就相当于C里面的printf(“……”); System.out.println(“…….”);这一个就相当于printf(“……\n”); 第一个使用命令行参数程序 public class ne">
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<meta property="article:published_time" content="2010-02-02T12:00:00.000Z">
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<meta property="article:modified_time" content="2026-08-04T10:47:21.897Z">
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JAVA里面重要而基础的东西
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<time title="创建时间：2010-02-02 23:00:00" itemprop="dateCreated datePublished" datetime="2010-02-02T23:00:00+11:00">2010-02-02</time>
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<div class="post-body" itemprop="articleBody"><p>其实JAVA是在C和C++上开发的，因此他们很多东西是类似的。下面就是我学习的过程中觉得一些很重要的东西，写下来吧。</p>
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<p><strong>JAVA里面输出语句有两种。</strong></p>
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<p><strong>System.out.print(“……”); <br>这一个就相当于C里面的printf(“……”);</strong></p>
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<p><strong>System.out.println(“…….”);这一个就相当于printf(“……\n”);</strong></p>
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<p>第一个使用命令行参数程序</p>
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<p>public class new1{</p>
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<p>public static void main (String[] args){</p>
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<p>System.out.print(“Hi, “);</p>
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<p>System.out.print(args[0]);</p>
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<p>System.out.println(“.How are you?”);</p>
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<p>}</p>
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<p>}</p>
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<p>编译命令为 javac new1.java</p>
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<p>java <br>new1 alice</p>
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<p>运行结果为 Hi, alice. How are<br>you?</p>
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<p><strong>Integer.parseInt()是将String值转为int值。例如： int<br>a=Integer.parseInt(args[o]);</strong></p>
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<p>比如这个整数的乘法与除法。</p>
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<p> public class new1</p>
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<p>{</p>
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<p> public static void main(String[] args)</p>
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<p> {</p>
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<p> int<br>a=Integer.parseInt(args[0]);</p>
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<p> int<br>b=Integer.parseInt(args[1]);</p>
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<p> int sum=a+b;</p>
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<p> int prod=a*b;</p>
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<p> int quot=a/b;</p>
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<p> int rem=a%b;</p>
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<p> System.out.println(a+”+”+b+”=”+sum);</p>
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<p> System.out.println(a+”*”+b+”=”+prod);</p>
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<p> System.out.println(a+”/“+b+”=”+quot);</p>
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<p> System.out.println(a+”%”+b+”=”+rem);</p>
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<p> System.out.println(a+”=”+quot+”*”+b+”=”+rem);</p>
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<p> }运行结果为：</p>
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<p>}<a target="_blank" rel="noopener" href="http://b31.photo.store.qq.com/http_imgload.cgi?/rurl4_b=d41256b632232b48d8dd65aaab89838fde93ab16b7c163f5b37a370284a5e77288bf478e19a5c8d93fea1c1fa3fe75bcf9b193aa72165f8d4be37e0c652ecfa06f5523fc764b6a972781a338ed554fd293a5830b&a=28&b=31"><img src="http://b31.photo.store.qq.com/http_imgload.cgi?/rurl4_b=d41256b632232b48d8dd65aaab89838fde93ab16b7c163f5b37a370284a5e77288bf478e19a5c8d93fea1c1fa3fe75bcf9b193aa72165f8d4be37e0c652ecfa06f5523fc764b6a972781a338ed554fd293a5830b&a=28&b=31" alt="图片"></a></p>
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<p><strong>这里需要说明的就是，a+,+b+,+quot.</strong></p>
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<p><strong>我们分析这句System.out.println(a+”%”+b+”=”+rem);</strong></p>
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<p><strong>就可以发现<br>这个a+,+b+,+quot.类似于C语言里面的取地址。而且它是成对称分布的。如果只有一个变量的话则按最后的变量形式输出。例如：+quot;</strong></p>
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<p> </p>
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<p>\\然后需要说的就是强制转换类型。其形式是比如：（int）1.10就是将1.10转化为整型</p>
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<p>还有几个容易混淆的：</p>
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<p>(int)11*0.3 <br>结果为： 3.3</p>
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<p>11*(int)0.3 <br>结果为： 0</p>
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<p>(int)(11*0.3) <br>结果为：3</p>
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<p>通过比较就可以看出区别了。</p>
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<p>下面是强制转换整型的一个例子得到随机整数：</p>
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<p>public class new2{</p>
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<p> public static void main(String[] args){</p>
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<p> int<br>n=Integer.parseInt(args[0]);</p>
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<p> double<br>r=Math.random();//产生0到1之间的随机数。</p>
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<p> int x=(int)(r*n);<br>//产生0到n-1之间的随机数。</p>
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<p> System.out.println(“Your random<br>number integer is:”+x);</p>
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<p> }</p>
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<p>}<a target="_blank" rel="noopener" href="http://b31.photo.store.qq.com/http_imgload.cgi?/rurl4_b=1cd8a98831d7e0027dc0462ed206bd35082ca154ce27b2712a124653120c1efbc61b10e82ebdbefeb8269aa616ce14cf8b97cff44f304a26019d572a8b387b322cdf0f769d15abe6c32d96689423c607c67e2ab1&a=28&b=31"><img src="http://b31.photo.store.qq.com/http_imgload.cgi?/rurl4_b=1cd8a98831d7e0027dc0462ed206bd35082ca154ce27b2712a124653120c1efbc61b10e82ebdbefeb8269aa616ce14cf8b97cff44f304a26019d572a8b387b322cdf0f769d15abe6c32d96689423c607c67e2ab1&a=28&b=31" alt="图片"></a>运行结果。</p>
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<p>我看书上有一个数的自动提升，我大概懂。它有这样一句话，“你可以使用任何基本数值类型的数据，这些数据类型有用户希望的，很大的取值范围。因为Java自动将这些类型转换到更大的范围。”</p>
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<p>同样有个例子。**b,c<br>都是int类型的。 b<em>b-4.0</em>c这个系统会自动将b,c<br>变到double类型再进行计算，最后的结果是double类型的。如果你想得到int<br>类型的，则需要将4.0改为4.则可。**</p>
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<p>好了就写这么多哦，哎，其实写这些好累人哦，但是仍然希望我可以坚持下去，这相当是我在重新学习一遍这些东西，一定对我有很大的帮助。</p>
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<p>加油。</p>
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