📄 csdn_文档中心_一步一步学java(第四课 方法、值传递、this关键字).htm
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style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">标</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-hansi-font-family: 'Times New Roman'">：掌握</SPAN><SPAN
lang=EN-US style="mso-ansi-language: EN-US">Java</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-hansi-font-family: 'Times New Roman'">方法的声明和调用方式</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。</SPAN></FONT></P>
<P class=a2
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 0cm; mso-char-indent-count: 0"><FONT
size=3><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">代</SPAN><SPAN
lang=EN-GB><SPAN style="mso-spacerun: yes">
</SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">码：</SPAN></FONT></P>
<P class=a2 style="MARGIN: 0cm 0cm 0pt"><FONT size=3><SPAN
lang=EN-GB style="mso-fareast-font-family: 楷体_GB2312">/*<SPAN
style="mso-tab-count: 1"> </SPAN></SPAN><SPAN
style="FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'">范例名称：</SPAN><SPAN
lang=EN-GB
style="mso-fareast-font-family: 楷体_GB2312">Java</SPAN><SPAN
style="FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'">方法使用举例</SPAN><SPAN
lang=EN-GB
style="mso-fareast-font-family: 楷体_GB2312"><o:p></o:p></SPAN></FONT></P>
<P class=a2 style="MARGIN: 0cm 0cm 0pt"><FONT size=3><SPAN
lang=EN-GB style="mso-fareast-font-family: 楷体_GB2312"><SPAN
style="mso-spacerun: yes"> </SPAN>* <SPAN
style="mso-tab-count: 1"> </SPAN></SPAN><SPAN
style="FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'">源文件名称：</SPAN><SPAN
lang=EN-GB
style="mso-fareast-font-family: 楷体_GB2312">Test.java<o:p></o:p></SPAN></FONT></P>
<P class=a2 style="MARGIN: 0cm 0cm 0pt"><FONT size=3><SPAN
lang=EN-GB style="mso-fareast-font-family: 楷体_GB2312"><SPAN
style="mso-spacerun: yes"> </SPAN>*<SPAN
style="mso-tab-count: 1"> </SPAN></SPAN><SPAN
style="FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'">要</SPAN><SPAN
lang=EN-GB style="mso-fareast-font-family: 楷体_GB2312"><SPAN
style="mso-spacerun: yes"> </SPAN></SPAN><SPAN
style="FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'">点：</SPAN><SPAN
lang=EN-GB
style="mso-fareast-font-family: 楷体_GB2312"><o:p></o:p></SPAN></FONT></P>
<P class=a2 style="MARGIN: 0cm 0cm 0pt"><FONT size=3><SPAN
lang=EN-GB style="mso-fareast-font-family: 楷体_GB2312"><SPAN
style="mso-spacerun: yes"> </SPAN>* <SPAN
style="mso-tab-count: 2">
</SPAN>1. </SPAN><SPAN
style="FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'">方法形参、实参的作用和用法</SPAN><SPAN
lang=EN-GB
style="mso-fareast-font-family: 楷体_GB2312"><o:p></o:p></SPAN></FONT></P>
<P class=a2 style="MARGIN: 0cm 0cm 0pt"><FONT size=3><SPAN
lang=EN-GB style="mso-fareast-font-family: 楷体_GB2312"><SPAN
style="mso-spacerun: yes"> </SPAN>*<SPAN
style="mso-tab-count: 2">
</SPAN>2. </SPAN><SPAN
style="FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'">返回值及返回值类型</SPAN><SPAN
lang=EN-GB
style="mso-fareast-font-family: 楷体_GB2312"><o:p></o:p></SPAN></FONT></P>
<P class=a2 style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB
style="mso-fareast-font-family: 楷体_GB2312"><FONT size=3><SPAN
style="mso-spacerun: yes"> </SPAN>*/<o:p></o:p></FONT></SPAN></P>
<P class=a2 style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB
style="mso-fareast-font-family: 楷体_GB2312"><FONT size=3>public class
Test{<o:p></o:p></FONT></SPAN></P>
<P class=a2 style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB
style="mso-fareast-font-family: 楷体_GB2312"><FONT size=3><SPAN
style="mso-tab-count: 1">
</SPAN>public int<SPAN style="mso-spacerun: yes">
</SPAN>method1(int a , int b, int c){<o:p></o:p></FONT></SPAN></P>
<P class=a2 style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB
style="mso-fareast-font-family: 楷体_GB2312"><FONT size=3><SPAN
style="mso-tab-count: 2">
</SPAN>int k = a + b + c;<o:p></o:p></FONT></SPAN></P>
<P class=a2 style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB
style="mso-fareast-font-family: 楷体_GB2312"><FONT size=3><SPAN
style="mso-tab-count: 2">
</SPAN>return k;<o:p></o:p></FONT></SPAN></P>
<P class=a2 style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB
style="mso-fareast-font-family: 楷体_GB2312"><FONT size=3><SPAN
style="mso-tab-count: 1">
</SPAN>}<o:p></o:p></FONT></SPAN></P>
<P class=a2 style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB
style="mso-fareast-font-family: 楷体_GB2312"><FONT size=3><SPAN
style="mso-tab-count: 1">
</SPAN>public static void main(String[]
args){<o:p></o:p></FONT></SPAN></P>
<P class=a2 style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB
style="mso-fareast-font-family: 楷体_GB2312"><FONT size=3><SPAN
style="mso-tab-count: 2">
</SPAN>Test t = new Test();<o:p></o:p></FONT></SPAN></P>
<P class=a2 style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB
style="mso-fareast-font-family: 楷体_GB2312"><FONT size=3><SPAN
style="mso-tab-count: 2">
</SPAN>int j = t.method1(3,4,5);<o:p></o:p></FONT></SPAN></P>
<P class=a2 style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB
style="mso-fareast-font-family: 楷体_GB2312"><FONT size=3><SPAN
style="mso-tab-count: 2">
</SPAN>System.out.println("the result is:" +
j);<o:p></o:p></FONT></SPAN></P>
<P class=a2 style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB
style="mso-fareast-font-family: 楷体_GB2312"><FONT size=3><SPAN
style="mso-tab-count: 1">
</SPAN>}<o:p></o:p></FONT></SPAN></P>
<P class=a2
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 0cm; mso-char-indent-count: 0"><SPAN
lang=EN-GB style="mso-fareast-font-family: 楷体_GB2312"><FONT
size=3><SPAN style="mso-tab-count: 1">
</SPAN>}</FONT></SPAN></P>
<P class=a
style="MARGIN: 6pt 0cm; TEXT-INDENT: 0cm; mso-char-indent-count: 0"><SPAN
lang=EN-GB><o:p><FONT size=3> </FONT></o:p></SPAN></P>
<P class=a
style="MARGIN: 6pt 0cm; TEXT-INDENT: 0cm; mso-char-indent-count: 0"><FONT
size=3><SPAN lang=EN-US style="mso-ansi-language: EN-US"><SPAN
style="mso-spacerun: yes"> </SPAN></SPAN><SPAN
lang=EN-GB>Java</SPAN><SPAN
style="FONT-FAMILY: 黑体; mso-ascii-font-family: 'Times New Roman'">方法使用举例</SPAN></FONT></P>
<P class=a2
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 0cm; mso-char-indent-count: 0"><FONT
size=3><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">案例文件：</SPAN><SPAN
lang=EN-GB>Test.java</SPAN></FONT></P>
<P class=a2
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 0cm; mso-char-indent-count: 0"><FONT
size=3><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">目</SPAN><SPAN
lang=EN-GB><SPAN style="mso-spacerun: yes">
</SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">标：</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-hansi-font-family: 'Times New Roman'">掌握</SPAN><SPAN
lang=EN-US style="mso-ansi-language: EN-US">Java</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-hansi-font-family: 'Times New Roman'">方法的声明和调用方式</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。</SPAN></FONT></P>
<P class=a2
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 0cm; mso-char-indent-count: 0"><FONT
size=3><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">代</SPAN><SPAN
lang=EN-GB><SPAN style="mso-spacerun: yes">
</SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">码：</SPAN></FONT></P>
<P class=a2
style="MARGIN: 0cm 0cm 0pt 10.5pt; TEXT-INDENT: 0cm; mso-char-indent-count: 0; mso-para-margin-left: 1.0gd"><FONT
size=3><SPAN lang=EN-GB>/*<SPAN style="mso-tab-count: 1">
</SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">范例名称：</SPAN><SPAN
lang=EN-GB>Java</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">方法使用举例</SPAN><SPAN
lang=EN-GB>2</SPAN></FONT></P>
<P class=a2
style="MARGIN: 0cm 0cm 0pt 10.5pt; TEXT-INDENT: 0cm; mso-char-indent-count: 0; mso-para-margin-left: 1.0gd"><FONT
size=3><SPAN lang=EN-GB><SPAN
style="mso-spacerun: yes"> </SPAN>* <SPAN
style="mso-tab-count: 1">
</SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">源文件名称：</SPAN><SPAN
lang=EN-GB>Test.java</SPAN></FONT></P>
<P class=a2
style="MARGIN: 0cm 0cm 0pt 10.5pt; TEXT-INDENT: 0cm; mso-char-indent-count: 0; mso-para-margin-left: 1.0gd"><FONT
size=3><SPAN lang=EN-GB><SPAN
style="mso-spacerun: yes"> </SPAN>*<SPAN
style="mso-tab-count: 1">
</SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">要</SPAN><SPAN
lang=EN-GB><SPAN style="mso-spacerun: yes">
</SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">点：</SPAN></FONT></P>
<P class=a2
style="MARGIN: 0cm 0cm 0pt 10.5pt; TEXT-INDENT: 0cm; mso-char-indent-count: 0; mso-para-margin-left: 1.0gd"><FONT
size=3><SPAN lang=EN-GB><SPAN
style="mso-spacerun: yes"> </SPAN>* <SPAN
style="mso-tab-count: 2">
</SPAN>1. </SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">方法参数匹配</SPAN></FONT></P>
<P class=a2
style="MARGIN: 0cm 0cm 0pt 10.5pt; TEXT-INDENT: 0cm; mso-char-indent-count: 0; mso-para-margin-left: 1.0gd"><FONT
size=3><SPAN lang=EN-GB><SPAN
style="mso-spacerun: yes"> </SPAN>*<SPAN
style="mso-tab-count: 2">
</SPAN>2. </SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">返回值的使用</SPAN></FONT></P>
<P class=a2
style="MARGIN: 0cm 0cm 0pt 10.5pt; TEXT-INDENT: 0cm; mso-char-indent-count: 0; mso-para-margin-left: 1.0gd"><SPAN
lang=EN-GB><FONT size=3><SPAN
style="mso-spacerun: yes"> </SPAN>*/</FONT></SPAN></P>
<P class=a2
style="MARGIN: 0cm 0cm 0pt 10.5pt; TEXT-INDENT: 0cm; mso-char-indent-count: 0; mso-para-margin-left: 1.0gd"><SPAN
lang=EN-GB><FONT size=3>class Tool{</FONT></SPAN></P>
<P class=a
style="MARGIN: 6pt 0cm 6pt 10.5pt; TEXT-INDENT: 15.65pt; mso-para-margin-left: 1.0gd"><SPAN
lang=EN-GB
style="FONT-SIZE: 10.5pt; mso-fareast-font-family: 楷体_GB2312; mso-bidi-font-size: 12.0pt; mso-font-kerning: 22.0pt"><SPAN
style="mso-tab-count: 1"> </SPAN>public
Tool(int i){<o:p></o:p></SPAN></P>
<P class=a
style="MARGIN: 6pt 0cm 6pt 10.5pt; TEXT-INDENT: 15.65pt; mso-para-margin-left: 1.0gd"><SPAN
lang=EN-GB
style="FONT-SIZE: 10.5pt; mso-fareast-font-family: 楷体_GB2312; mso-bidi-font-size: 12.0pt; mso-font-kerning: 22.0pt"><SPAN
style="mso-tab-count: 1">
</SPAN>}<o:p></o:p></SPAN></P>
<P class=a
style="MARGIN: 6pt 0cm 6pt 10.5pt; TEXT-INDENT: 15.65pt; mso-para-margin-left: 1.0gd"><SPAN
lang=EN-GB
style="FONT-SIZE: 10.5pt; mso-fareast-font-family: 楷体_GB2312; mso-bidi-font-size: 12.0pt; mso-font-kerning: 22.0pt"><SPAN
style="mso-tab-count: 1"> </SPAN>public
int<SPAN style="mso-spacerun: yes"> </SPAN>add(int a , int b,
int c){<o:p></o:p></SPAN></P>
<P class=a
style="MARGIN: 6pt 0cm 6pt 10.5pt; TEXT-INDENT: 15.65pt; mso-para-margin-left: 1.0gd"><SPAN
lang=EN-GB
style="FONT-SIZE: 10.5pt; mso-fareast-font-family: 楷体_GB2312; mso-bidi-font-size: 12.0pt; mso-font-kerning: 22.0pt"><SPAN
style="mso-tab-count: 2">
</SPAN>int k = a + b + c;<o:p></o:p></SPAN></P>
<P class=a
style="MARGIN: 6pt 0cm 6pt 10.5pt; TEXT-INDENT: 15.65pt; mso-para-margin-left: 1.0gd"><SPAN
lang=EN-GB
style="FONT-SIZE: 10.5pt; mso-fareast-font-family: 楷体_GB2312; mso-bidi-font-size: 12.0pt; mso-font-kerning: 22.0pt"><SPAN
style="mso-tab-count: 2">
</SPAN>return k;<o:p></o:p></SPAN></P>
<P class=a
style="MARGIN: 6pt 0cm 6pt 10.5pt; TEXT-INDENT: 15.65pt; mso-para-margin-left: 1.0gd"><SPAN
lang=EN-GB
style="FONT-SIZE: 10.5pt; mso-fareast-font-family: 楷体_GB2312; mso-bidi-font-size: 12.0pt; mso-font-kerning: 22.0pt"><SPAN
style="mso-tab-count: 1">
</SPAN>}<o:p></o:p></SPAN></P>
<P class=a
style="MARGIN: 6pt 0cm 6pt 10.5pt; TEXT-INDENT: 15.65pt; mso-para-margin-left: 1.0gd"><SPAN
lang=EN-GB
style="FONT-SIZE: 10.5pt; mso-fareast-font-family: 楷体_GB2312; mso-bidi-font-size: 12.0pt; mso-font-kerning: 22.0pt"><SPAN
style="mso-tab-count: 1"> </SPAN>public void
add_display(int a , int b, int c){<o:p></o:p></SPAN></P>
<P class=a
style="MARGIN: 6pt 0cm 6pt 10.5pt; TEXT-INDENT: 15.65pt; mso-para-margin-left: 1.0gd"><SPAN
lang=EN-GB
style="FONT-SIZE: 10.5pt; mso-fareast-font-family: 楷体_GB2312; mso-bidi-font-size: 12.0pt; mso-font-kerning: 22.0pt"><SPAN
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