Reflection in Java. 介绍Java中的反射机制

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<DIV align=3Dleft><FONT size=3D2><SPAN style=3D"COLOR: black">Reflection =
</SPAN><SPAN=20
style=3D"COLOR: black">=E6=98=AF</SPAN><SPAN style=3D"COLOR: =
black">Java</SPAN><SPAN=20
style=3D"COLOR: =
black">=E8=A2=AB=E8=A7=86=E4=B8=BA=E5=8A=A8=E6=80=81=EF=BC=88=E6=88=96=E5=
=87=86=E5=8A=A8=E6=80=81=EF=BC=89=E8=AF=AD=E8=A8=80=E7=9A=84=E4=B8=80=E4=B8=
=AA=E5=85=B3=E9=94=AE=E6=80=A7=E8=B4=A8=E3=80=82=E8=BF=99=E4=B8=AA=E6=9C=BA=
=E5=88=B6=E5=85=81=E8=AE=B8=E7=A8=8B=E5=BA=8F=E5=9C=A8=E8=BF=90=E8=A1=8C=E6=
=97=B6=E9=80=8F=E8=BF=87</SPAN><SPAN=20
style=3D"COLOR: black">Reflection APIs</SPAN><SPAN=20
style=3D"COLOR: =
black">=E5=8F=96=E5=BE=97=E4=BB=BB=E4=BD=95=E4=B8=80=E4=B8=AA=E5=B7=B2=E7=
=9F=A5=E5=90=8D=E7=A7=B0=E7=9A=84</SPAN><SPAN=20
style=3D"COLOR: black">class</SPAN><SPAN=20
style=3D"COLOR: =
black">=E7=9A=84=E5=86=85=E9=83=A8=E4=BF=A1=E6=81=AF=EF=BC=8C=E5=8C=85=E6=
=8B=AC=E5=85=B6</SPAN><SPAN=20
style=3D"COLOR: black">modifiers</SPAN><SPAN style=3D"COLOR: =
black">=EF=BC=88=E8=AF=B8=E5=A6=82</SPAN><SPAN=20
style=3D"COLOR: black">public,</SPAN></FONT>static <SPAN=20
style=3D"COLOR: black">=E7=AD=89=E7=AD=89=EF=BC=89=E3=80=81</SPAN><SPAN=20
style=3D"COLOR: black">superclass</SPAN><SPAN style=3D"COLOR: =
black">=EF=BC=88=E4=BE=8B=E5=A6=82</SPAN><SPAN=20
style=3D"COLOR: black">Object</SPAN><SPAN style=3D"COLOR: =
black">=EF=BC=89=E3=80=81=E5=AE=9E=E7=8E=B0=E4=B9=8B</SPAN><SPAN=20
style=3D"COLOR: black">interfaces</SPAN><SPAN style=3D"COLOR: =
black">=EF=BC=88=E4=BE=8B=E5=A6=82</SPAN><SPAN=20
style=3D"COLOR: black">Cloneable</SPAN><SPAN=20
style=3D"COLOR: =
black">=EF=BC=89=EF=BC=8C=E4=B9=9F=E5=8C=85=E6=8B=AC</SPAN><SPAN =
style=3D"COLOR: black">fields</SPAN><SPAN=20
style=3D"COLOR: black">=E5=92=8C</SPAN><SPAN style=3D"COLOR: =
black">methods</SPAN><SPAN=20
style=3D"COLOR: =
black">=E7=9A=84=E6=89=80=E6=9C=89=E4=BF=A1=E6=81=AF=EF=BC=8C=E5=B9=B6=E5=
=8F=AF=E4=BA=8E=E8=BF=90=E8=A1=8C=E6=97=B6=E6=94=B9=E5=8F=98</SPAN><SPAN =

style=3D"COLOR: black">fields</SPAN><SPAN style=3D"COLOR: =
black">=E5=86=85=E5=AE=B9=E6=88=96=E5=94=A4=E8=B5=B7</SPAN><SPAN=20
style=3D"COLOR: black">methods</SPAN><SPAN=20
style=3D"COLOR: =
black">=E3=80=82=E6=9C=AC=E6=96=87=E5=80=9F=E7=94=B1=E5=AE=9E=E4=BE=8B=EF=
=BC=8C=E5=A4=A7=E9=9D=A2=E7=A7=AF=E7=A4=BA=E8=8C=83</SPAN><SPAN =
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APIs</SPAN><SPAN style=3D"COLOR: black">=E3=80=82</SPAN> </DIV>
<DIV align=3Dleft>&nbsp;</DIV>
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ONG></DIV>
<DIV align=3Dleft><FONT size=3D2><SPAN style=3D"COLOR: =
black">=E8=AF=BB=E8=80=85=E5=9F=BA=E7=A1=80=EF=BC=9A=E5=85=B7=E5=A4=87</S=
PAN><SPAN=20
style=3D"COLOR: black">Java </SPAN><SPAN=20
style=3D"COLOR: =
black">=E8=AF=AD=E8=A8=80=E5=9F=BA=E7=A1=80=E3=80=82</SPAN></FONT></DIV>
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black">=E6=9C=AC=E6=96=87=E9=80=82=E7=94=A8=E5=B7=A5=E5=85=B7=EF=BC=9A</S=
PAN><SPAN=20
style=3D"COLOR: black">JDK1.5</SPAN></FONT></DIV>
<DIV align=3Dleft>&nbsp;</DIV>
<DIV align=3Dleft><STRONG><SPAN style=3D"COLOR: black"><FONT=20
size=3D2>=E5=85=B3=E9=94=AE=E8=AF=8D=EF=BC=9A</FONT></SPAN></STRONG></DIV=
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<DIV align=3Dleft><FONT size=3D2><SPAN=20
style=3D"COLOR: black">Introspection</SPAN><SPAN=20
style=3D"COLOR: =
black">=EF=BC=88=E5=86=85=E7=9C=81=E3=80=81=E5=86=85=E8=A7=82=EF=BC=89</S=
PAN></FONT></DIV>
<DIV align=3Dleft><FONT size=3D2><SPAN style=3D"COLOR: =
black">Reflection</SPAN><SPAN=20
style=3D"COLOR: =
black">=EF=BC=88=E5=8F=8D=E5=B0=84=EF=BC=89</SPAN></FONT></DIV>
<DIV align=3Dleft>&nbsp;</DIV>
<DIV align=3Dleft>&nbsp;</DIV>
<DIV align=3Dleft><FONT size=3D2><SPAN=20
style=3D"COLOR: =
black">=E6=9C=89=E6=97=B6=E5=80=99=E6=88=91=E4=BB=AC=E8=AF=B4=E6=9F=90=E4=
=B8=AA=E8=AF=AD=E8=A8=80=E5=85=B7=E6=9C=89=E5=BE=88=E5=BC=BA=E7=9A=84=E5=8A=
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=E4=BC=9A=E5=8C=BA=E5=88=86=E5=8A=A8=E6=80=81=E5=92=8C=E9=9D=99=E6=80=81=E7=
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=82=E6=88=91=E4=BB=AC=E6=9C=97=E6=9C=97=E4=B8=8A=E5=8F=A3=E5=8A=A8=E6=80=81=
=E7=BB=91=E5=AE=9A=EF=BC=88</SPAN><SPAN=20
style=3D"COLOR: black">dynamic binding</SPAN><SPAN=20
style=3D"COLOR: =
black">=EF=BC=89=E3=80=81=E5=8A=A8=E6=80=81=E9=93=BE=E6=8E=A5=EF=BC=88</S=
PAN><SPAN style=3D"COLOR: black">dynamic=20
linking</SPAN><SPAN style=3D"COLOR: =
black">=EF=BC=89=E3=80=81=E5=8A=A8=E6=80=81=E5=8A=A0=E8=BD=BD=EF=BC=88</S=
PAN><SPAN=20
style=3D"COLOR: black">dynamic loading</SPAN><SPAN=20
style=3D"COLOR: =
black">=EF=BC=89=E7=AD=89=E3=80=82=E7=84=B6=E8=80=8C</SPAN><SPAN =
style=3D"COLOR: black">=E2=80=9C</SPAN><SPAN=20
style=3D"COLOR: black">=E5=8A=A8=E6=80=81</SPAN><SPAN style=3D"COLOR: =
black">=E2=80=9D</SPAN><SPAN=20
style=3D"COLOR: =
black">=E4=B8=80=E8=AF=8D=E5=85=B6=E5=AE=9E=E6=B2=A1=E6=9C=89=E7=BB=9D=E5=
=AF=B9=E8=80=8C=E6=99=AE=E9=81=8D=E9=80=82=E7=94=A8=E7=9A=84=E4=B8=A5=E6=A0=
=BC=E5=AE=9A=E4=B9=89=EF=BC=8C=E6=9C=89=E6=97=B6=E5=80=99=E7=94=9A=E8=87=B3=
=E5=83=8F=E5=AF=B9=E8=B1=A1=E5=AF=BC=E5=90=91=E5=BD=93=E5=88=9D=E8=A2=AB=E5=
=AF=BC=E5=85=A5=E7=BC=96=E7=A8=8B=E9=A2=86=E5=9F=9F=E4=B8=80=E6=A0=B7=EF=BC=
=8C=E4=B8=80=E4=BA=BA=E4=B8=80=E6=8A=8A=E5=8F=B7=EF=BC=8C=E5=90=84=E5=90=B9=
=E5=90=84=E7=9A=84=E8=B0=83=E3=80=82</SPAN></FONT></DIV>
<DIV align=3Dleft>&nbsp;</DIV>
<DIV align=3Dleft><FONT size=3D2><SPAN=20
style=3D"COLOR: =
black">=E4=B8=80=E8=88=AC=E8=80=8C=E8=A8=80=EF=BC=8C=E5=BC=80=E5=8F=91=E8=
=80=85=E7=A4=BE=E7=BE=A4=E8=AF=B4=E5=88=B0=E5=8A=A8=E6=80=81=E8=AF=AD=E8=A8=
=80=EF=BC=8C=E5=A4=A7=E8=87=B4=E8=AE=A4=E5=90=8C=E7=9A=84=E4=B8=80=E4=B8=AA=
=E5=AE=9A=E4=B9=89=E6=98=AF=EF=BC=9A</SPAN><SPAN=20
style=3D"COLOR: black">=E2=80=9C</SPAN><SPAN=20
style=3D"COLOR: =
black">=E7=A8=8B=E5=BA=8F=E8=BF=90=E8=A1=8C=E6=97=B6=EF=BC=8C=E5=85=81=E8=
=AE=B8=E6=94=B9=E5=8F=98=E7=A8=8B=E5=BA=8F=E7=BB=93=E6=9E=84=E6=88=96=E5=8F=
=98=E9=87=8F=E7=B1=BB=E5=9E=8B=EF=BC=8C=E8=BF=99=E7=A7=8D=E8=AF=AD=E8=A8=80=
=E7=A7=B0=E4=B8=BA=E5=8A=A8=E6=80=81=E8=AF=AD=E8=A8=80</SPAN><SPAN=20
style=3D"COLOR: black">=E2=80=9D</SPAN><SPAN style=3D"COLOR: =
black">=E3=80=82=E4=BB=8E=E8=BF=99=E4=B8=AA=E8=A7=82=E7=82=B9=E7=9C=8B=EF=
=BC=8C</SPAN><SPAN=20
style=3D"COLOR: black">Perl</SPAN><SPAN style=3D"COLOR: =
black">=EF=BC=8C</SPAN><SPAN=20
style=3D"COLOR: black">Python</SPAN><SPAN style=3D"COLOR: =
black">=EF=BC=8C</SPAN><SPAN=20
style=3D"COLOR: black">Ruby</SPAN><SPAN style=3D"COLOR: =
black">=E6=98=AF=E5=8A=A8=E6=80=81=E8=AF=AD=E8=A8=80=EF=BC=8C</SPAN><SPAN=
=20
style=3D"COLOR: black">C++</SPAN><SPAN style=3D"COLOR: =
black">=EF=BC=8C</SPAN><SPAN=20
style=3D"COLOR: black">Java</SPAN><SPAN style=3D"COLOR: =
black">=EF=BC=8C</SPAN><SPAN=20
style=3D"COLOR: black">C#</SPAN><SPAN=20
style=3D"COLOR: =
black">=E4=B8=8D=E6=98=AF=E5=8A=A8=E6=80=81=E8=AF=AD=E8=A8=80=E3=80=82</S=
PAN></FONT></DIV>
<DIV align=3Dleft>&nbsp;</DIV>
<DIV align=3Dleft><FONT size=3D2><SPAN style=3D"COLOR: =
black">=E5=B0=BD=E7=AE=A1=E5=9C=A8=E8=BF=99=E6=A0=B7=E7=9A=84=E5=AE=9A=E4=
=B9=89=E4=B8=8E=E5=88=86=E7=B1=BB=E4=B8=8B</SPAN><SPAN=20
style=3D"COLOR: black">Java</SPAN><SPAN=20
style=3D"COLOR: =
black">=E4=B8=8D=E6=98=AF=E5=8A=A8=E6=80=81=E8=AF=AD=E8=A8=80=EF=BC=8C=E5=
=AE=83=E5=8D=B4=E6=9C=89=E7=9D=80=E4=B8=80=E4=B8=AA=E9=9D=9E=E5=B8=B8=E7=AA=
=81=E5=87=BA=E7=9A=84=E5=8A=A8=E6=80=81=E7=9B=B8=E5=85=B3=E6=9C=BA=E5=88=B6=
=EF=BC=9A</SPAN><STRONG><SPAN=20
style=3D"COLOR: black">Reflection</SPAN></STRONG><SPAN=20
style=3D"COLOR: =
black">=E3=80=82=E8=BF=99=E4=B8=AA=E5=AD=97=E7=9A=84=E6=84=8F=E6=80=9D=E6=
=98=AF</SPAN><SPAN style=3D"COLOR: black">=E2=80=9C</SPAN><SPAN=20
style=3D"COLOR: =
blue">=E5=8F=8D=E5=B0=84=E3=80=81=E6=98=A0=E8=B1=A1=E3=80=81=E5=80=92=E5=BD=
=B1</SPAN><SPAN style=3D"COLOR: black">=E2=80=9D</SPAN><SPAN=20
style=3D"COLOR: black">=EF=BC=8C=E7=94=A8=E5=9C=A8</SPAN><SPAN =
style=3D"COLOR: black">Java</SPAN><SPAN=20
style=3D"COLOR: =
black">=E8=BA=AB=E4=B8=8A=E6=8C=87=E7=9A=84=E6=98=AF=E6=88=91=E4=BB=AC=E5=
=8F=AF=E4=BB=A5=E4=BA=8E=E8=BF=90=E8=A1=8C=E6=97=B6=E5=8A=A0=E8=BD=BD=E3=80=
=81=E6=8E=A2=E7=9F=A5=E3=80=81=E4=BD=BF=E7=94=A8=E7=BC=96=E8=AF=91=E6=9C=9F=
=E9=97=B4=E5=AE=8C=E5=85=A8=E6=9C=AA=E7=9F=A5=E7=9A=84</SPAN><SPAN=20
style=3D"COLOR: black">classes</SPAN><SPAN style=3D"COLOR: =
black">=E3=80=82=E6=8D=A2=E5=8F=A5=E8=AF=9D=E8=AF=B4=EF=BC=8C</SPAN><SPAN=
=20
style=3D"COLOR: black">Java</SPAN><SPAN=20
style=3D"COLOR: =
black">=E7=A8=8B=E5=BA=8F=E5=8F=AF=E4=BB=A5=E5=8A=A0=E8=BD=BD=E4=B8=80=E4=
=B8=AA=E8=BF=90=E8=A1=8C=E6=97=B6=E6=89=8D=E5=BE=97=E7=9F=A5=E5=90=8D=E7=A7=
=B0=E7=9A=84</SPAN><SPAN=20
style=3D"COLOR: black">class</SPAN><SPAN=20
style=3D"COLOR: =
black">=EF=BC=8C=E8=8E=B7=E6=82=89=E5=85=B6=E5=AE=8C=E6=95=B4=E6=9E=84=E9=
=80=A0=EF=BC=88=E4=BD=86=E4=B8=8D=E5=8C=85=E6=8B=AC</SPAN><SPAN=20
style=3D"COLOR: black">methods</SPAN><SPAN=20
style=3D"COLOR: =
black">=E5=AE=9A=E4=B9=89=EF=BC=89=EF=BC=8C=E5=B9=B6=E7=94=9F=E6=88=90=E5=
=85=B6=E5=AF=B9=E8=B1=A1=E5=AE=9E=E4=BD=93=E3=80=81=E6=88=96=E5=AF=B9=E5=85=
=B6</SPAN><SPAN=20
style=3D"COLOR: black">fields</SPAN><SPAN style=3D"COLOR: =
black">=E8=AE=BE=E5=80=BC=E3=80=81=E6=88=96=E5=94=A4=E8=B5=B7=E5=85=B6</S=
PAN><SPAN=20
style=3D"COLOR: black">methods</SPAN><SUP><SPAN=20
style=3D"COLOR: blue">1</SPAN></SUP><SPAN style=3D"COLOR: =
black">=E3=80=82=E8=BF=99=E7=A7=8D</SPAN><SPAN=20
style=3D"COLOR: black">=E2=80=9C</SPAN><SPAN style=3D"COLOR: =
black">=E7=9C=8B=E9=80=8F</SPAN><SPAN=20
style=3D"COLOR: black">class</SPAN><SPAN style=3D"COLOR: =
black">=E2=80=9D</SPAN><SPAN=20
style=3D"COLOR: black">=E7=9A=84=E8=83=BD=E5=8A=9B=EF=BC=88</SPAN><SPAN =
style=3D"COLOR: black">the ability of the=20
program to examine itself</SPAN><SPAN style=3D"COLOR: =
black">=EF=BC=89=E8=A2=AB=E7=A7=B0=E4=B8=BA</SPAN><SPAN=20
style=3D"COLOR: black">introspection</SPAN><SPAN=20
style=3D"COLOR: black">=EF=BC=88</SPAN><SPAN style=3D"COLOR: =
blue">=E5=86=85=E7=9C=81=E3=80=81=E5=86=85=E8=A7=82=E3=80=81=E5=8F=8D=E7=9C=
=81</SPAN><SPAN=20
style=3D"COLOR: black">=EF=BC=89=E3=80=82</SPAN><SPAN style=3D"COLOR: =
black">Reflection</SPAN><SPAN=20
style=3D"COLOR: black">=E5=92=8C</SPAN><SPAN=20
style=3D"COLOR: black">introspection</SPAN><SPAN=20
style=3D"COLOR: =
black">=E6=98=AF=E5=B8=B8=E8=A2=AB=E5=B9=B6=E6=8F=90=E7=9A=84=E4=B8=A4=E4=
=B8=AA=E6=9C=AF=E8=AF=AD=E3=80=82</SPAN></FONT></DIV>
<DIV align=3Dleft>&nbsp;</DIV>
<DIV align=3Dleft><FONT size=3D2><SPAN style=3D"COLOR: =
black">Java</SPAN><SPAN=20
style=3D"COLOR: =
black">=E5=A6=82=E4=BD=95=E8=83=BD=E5=A4=9F=E5=81=9A=E5=87=BA=E4=B8=8A=E8=
=BF=B0=E7=9A=84=E5=8A=A8=E6=80=81=E7=89=B9=E6=80=A7=E5=91=A2=EF=BC=9F=E8=BF=
=99=E6=98=AF=E4=B8=80=E4=B8=AA=E6=B7=B1=E8=BF=9C=E8=AF=9D=E9=A2=98=EF=BC=8C=
=E6=9C=AC=E6=96=87=E5=AF=B9=E6=AD=A4=E5=8F=AA=E7=AE=80=E5=8D=95=E4=BB=8B=E7=
=BB=8D=E4=B8=80=E4=BA=9B=E6=A6=82=E5=BF=B5=E3=80=82=E6=95=B4=E4=B8=AA=E7=AF=
=87=E5=B9=85=E6=9C=80=E4=B8=BB=E8=A6=81=E8=BF=98=E6=98=AF=E4=BB=8B=E7=BB=8D=
</SPAN><SPAN=20
style=3D"COLOR: black">Reflection APIs</SPAN><SPAN=20
style=3D"COLOR: =
black">=EF=BC=8C=E4=B9=9F=E5=B0=B1=E6=98=AF=E8=AE=A9=E8=AF=BB=E8=80=85=E7=
=9F=A5=E9=81=93=E5=A6=82=E4=BD=95=E6=8E=A2=E7=B4=A2</SPAN><SPAN=20
style=3D"COLOR: black">class</SPAN><SPAN=20
style=3D"COLOR: =
black">=E7=9A=84=E7=BB=93=E6=9E=84=E3=80=81=E5=A6=82=E4=BD=95=E5=AF=B9=E6=
=9F=90=E4=B8=AA</SPAN><SPAN style=3D"COLOR: black">=E2=80=9C</SPAN><SPAN =

style=3D"COLOR: =
black">=E8=BF=90=E8=A1=8C=E6=97=B6=E6=89=8D=E8=8E=B7=E7=9F=A5=E5=90=8D=E7=
=A7=B0=E7=9A=84</SPAN><SPAN=20
style=3D"COLOR: black">class</SPAN><SPAN style=3D"COLOR: =
black">=E2=80=9D</SPAN><SPAN=20
style=3D"COLOR: =
black">=E7=94=9F=E6=88=90=E4=B8=80=E4=BB=BD=E5=AE=9E=E4=BD=93=E3=80=81=E4=
=B8=BA=E5=85=B6</SPAN><SPAN=20
style=3D"COLOR: black">fields</SPAN><SPAN style=3D"COLOR: =
black">=E8=AE=BE=E5=80=BC=E3=80=81=E8=B0=83=E7=94=A8=E5=85=B6</SPAN><SPAN=
=20
style=3D"COLOR: black">methods</SPAN><SPAN style=3D"COLOR: =
black">=E3=80=82=E6=9C=AC=E6=96=87=E5=B0=86=E8=B0=88=E5=88=B0</SPAN><SPAN=
=20
style=3D"COLOR: black">java.lang.Class</SPAN><SPAN=20
style=3D"COLOR: black">=EF=BC=8C=E4=BB=A5=E5=8F=8A</SPAN><SPAN=20
style=3D"COLOR: black">java.lang.reflect</SPAN><SPAN=20
style=3D"COLOR: black">=E4=B8=AD=E7=9A=84</SPAN><SPAN style=3D"COLOR: =