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Android (java) Learning Note 97:scanner class use

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<span id="Label3"></p><pre><span style="color: #008080;"><span style="color: #008080;">1</span></span> <span style="color: #0000ff;"><span style="color: #0000ff;"></span> package</span><span style="color: #000000;"><span style="color: #000000;">cn.itcast_01;</span></span><span style="color: #008080;"><span style="color: #008080;">2</span></span> <span style="color: #008080;"><span style="color: #008080;">3</span></span> <span style="color: #008000;"><span style="color: #008000;">/*</span></span><span style="color: #008080;"><span style="color: #008080;">4</span></span> <span style="color: #008000;"><span style="color: #008000;">* Scanner: used to receive keyboard input Data. </span></span><span style="color: #008080;"><span style="color: #008080;">5</span></span> <span style="color: #008000;"><span style="color: #008000;"> * </span></span><span style="color: #008080;"><span style="color: #008080;">6</span></span> <span style="color: #008000;"><span style="color: #008000;">* In front of the time:</span></span><span style="color: #008080;"><span style="color: #008080;">7</span></span> <span style="color: #008000;"><span style="color: #008000;">* A: Guide Package</span></span><span style="color: #008080;"><span style="color: #008080;">8</span></span> <span style="color: #008000;"><span style="color: #008000;">* B: Create object</span></span><span style="color: #008080;"><span style="color: #008080;">9</span></span> <span style="color: #008000;"><span style="color: #008000;">* C: Call Method</span></span><span style="color: #008080;"><span style="color: #008080;">Ten</span></span> <span style="color: #008000;"><span style="color: #008000;"> * </span></span><span style="color: #008080;"><span style="color: #008080;"></span> one</span> <span style="color: #008000;"><span style="color: #008000;">* There is a static field under the system Class:</span></span><span style="color: #008080;"><span style="color: #008080;"></span> a</span> <span style="color: #008000;"><span style="color: #008000;">* public static final InputStream in; standard input stream, corresponding to keyboard Input. </span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #008000;"><span style="color: #008000;"> * </span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #008000;"><span style="color: #008000;">* InputStream is = system.in;</span></span><span style="color: #008080;"><span style="color: #008080;"></span> the</span> <span style="color: #008000;"><span style="color: #008000;"> * </span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #008000;"><span style="color: #008000;">* Class Demo {</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #008000;"><span style="color: #008000;">* public static final int x = ten;</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #008000;"><span style="color: #008000;">* public static final Student s = new Student ();</span></span><span style="color: #008080;"><span style="color: #008080;"></span> +</span> <span style="color: #008000;"><span style="color: #008000;"> * }</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #008000;"><span style="color: #008000;">* int y = demo.x;</span></span><span style="color: #008080;"><span style="color: #008080;"></span> +</span> <span style="color: #008000;"><span style="color: #008000;">* Student s = demo.s;</span></span><span style="color: #008080;"><span style="color: #008080;"></span> a</span> <span style="color: #008000;"><span style="color: #008000;"> * </span></span><span style="color: #008080;"><span style="color: #008080;"></span> at</span> <span style="color: #008000;"><span style="color: #008000;"> * </span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #008000;"><span style="color: #008000;">* Construction Method:</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #008000;"><span style="color: #008000;">* Scanner (inputstream source)</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #008000;"><span style="color: #008000;">*/</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #0000ff;"><span style="color: #0000ff;">Import</span></span><span style="color: #000000;"><span style="color: #000000;">java.util.Scanner;</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #008080;"><span style="color: #008080;"></span> in</span> <span style="color: #0000ff;"><span style="color: #0000ff;"></span> public</span> <span style="color: #0000ff;"><span style="color: #0000ff;">class</span></span><span style="color: #000000;"><span style="color: #000000;">Scannerdemo {</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #0000ff;"><span style="color: #0000ff;"></span> public</span> <span style="color: #0000ff;"><span style="color: #0000ff;">Static</span></span> <span style="color: #0000ff;"><span style="color: #0000ff;">void</span></span><span style="color: #000000;"><span style="color: #000000;">main (string[] Args) {</span></span><span style="color: #008080;"><span style="color: #008080;"></span> to</span> <span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008000;"><span style="color: #008000;">Creating Objects</span></span><span style="color: #008080;"><span style="color: #008080;"></span> +</span>Scanner sc =<span style="color: #0000ff;"><span style="color: #0000ff;">New</span></span><span style="color: #000000;"><span style="color: #000000;">Scanner (system.in);</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #008080;"><span style="color: #008080;"></span> the</span> <span style="color: #0000ff;"><span style="color: #0000ff;">int</span></span>x =<span style="color: #000000;"><span style="color: #000000;">Sc.nextint ();</span></span><span style="color: #008080;"><span style="color: #008080;"></span> *</span> <span style="color: #008080;"><span style="color: #008080;"></span> $</span>System.out.println ("x:" +<span style="color: #000000;"><span style="color: #000000;">x);</span></span><span style="color: #008080;"><span style="color: #008080;">Panax Notoginseng</span></span> <span style="color: #000000;"><span style="color: #000000;"> }</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span>}</pre><p><p></p></p><pre><span style="color: #008080;"><span style="color: #008080;">1</span></span> <span style="color: #0000ff;"><span style="color: #0000ff;"></span> package</span><span style="color: #000000;"><span style="color: #000000;">cn.itcast_02;</span></span><span style="color: #008080;"><span style="color: #008080;">2</span></span> <span style="color: #008080;"><span style="color: #008080;">3</span></span> <span style="color: #0000ff;"><span style="color: #0000ff;">Import</span></span><span style="color: #000000;"><span style="color: #000000;">java.util.Scanner;</span></span><span style="color: #008080;"><span style="color: #008080;">4</span></span> <span style="color: #008080;"><span style="color: #008080;">5</span></span> <span style="color: #008000;"><span style="color: #008000;">/*</span></span><span style="color: #008080;"><span style="color: #008080;">6</span></span> <span style="color: #008000;"><span style="color: #008000;">* Basic Format:</span></span><span style="color: #008080;"><span style="color: #008080;">7</span></span> <span style="color: #008000;"><span style="color: #008000;">* Public Boolean hasnextxxx (): determines whether a certain type of element</span></span><span style="color: #008080;"><span style="color: #008080;">8</span></span> <span style="color: #008000;"><span style="color: #008000;">* Public Xxx nextxxx (): gets the element</span></span><span style="color: #008080;"><span style="color: #008080;">9</span></span> <span style="color: #008000;"><span style="color: #008000;"> * </span></span><span style="color: #008080;"><span style="color: #008080;">Ten</span></span> <span style="color: #008000;"><span style="color: #008000;">* example: An int type Method Example</span></span><span style="color: #008080;"><span style="color: #008080;"></span> one</span> <span style="color: #008000;"><span style="color: #008000;">* Public boolean hasnextint ()</span></span><span style="color: #008080;"><span style="color: #008080;"></span> a</span> <span style="color: #008000;"><span style="color: #008000;">* public int nextint ()</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #008000;"><span style="color: #008000;"> * </span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #008000;"><span style="color: #008000;">* Note:</span></span><span style="color: #008080;"><span style="color: #008080;"></span> the</span> <span style="color: #008000;"><span style="color: #008000;">* Inputmismatchexception: The input does not match the one you want</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #008000;"><span style="color: #008000;">*/</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #0000ff;"><span style="color: #0000ff;"></span> public</span> <span style="color: #0000ff;"><span style="color: #0000ff;">class</span></span><span style="color: #000000;"><span style="color: #000000;">Scannerdemo {</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #0000ff;"><span style="color: #0000ff;"></span> public</span> <span style="color: #0000ff;"><span style="color: #0000ff;">Static</span></span> <span style="color: #0000ff;"><span style="color: #0000ff;">void</span></span><span style="color: #000000;"><span style="color: #000000;">main (string[] Args) {</span></span><span style="color: #008080;"><span style="color: #008080;"></span> +</span> <span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008000;"><span style="color: #008000;">Creating Objects</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span>Scanner sc =<span style="color: #0000ff;"><span style="color: #0000ff;">New</span></span><span style="color: #000000;"><span style="color: #000000;">Scanner (system.in);</span></span><span style="color: #008080;"><span style="color: #008080;"></span> +</span> <span style="color: #008080;"><span style="color: #008080;"></span> a</span> <span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008000;"><span style="color: #008000;">Get Data</span></span><span style="color: #008080;"><span style="color: #008080;"></span> at</span> <span style="color: #0000ff;"><span style="color: #0000ff;">if</span></span><span style="color: #000000;"><span style="color: #000000;">(sc.hasnextint ()) {</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #0000ff;"><span style="color: #0000ff;">int</span></span>x =<span style="color: #000000;"><span style="color: #000000;">Sc.nextint ();</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span>System.out.println ("x:" +<span style="color: #000000;"><span style="color: #000000;">x);</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span>}<span style="color: #0000ff;"><span style="color: #0000ff;">Else</span></span><span style="color: #000000;"><span style="color: #000000;"> {</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span>SYSTEM.OUT.PRINTLN ("the Data you entered is wrong"<span style="color: #000000;"><span style="color: #000000;">);</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #000000;"><span style="color: #000000;"> }</span></span><span style="color: #008080;"><span style="color: #008080;"></span> in</span> <span style="color: #000000;"><span style="color: #000000;"> }</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span>}</pre><p><p></p></p><p><p>Android (java) Learning Note 97:scanner class use</p></p></span>

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