后来把Eclipse的编译级别（Compiler Compliance Level）改成1.4就可以了。终于可以在Eclipse中用模拟器运行HelloWorld程序。
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Change the Compiler compliance level field value to 1.4 as shown in figure 3.
将Compiler compliance level字段的值修改为1.4，如图3所示。
Set the Compiler compliance level to 1.4, deselect "Use default compliance settings," and set "Generated .class files compatibility" and "Source compatibility" to 1.4.
将 Compiler compliance level 设置为 1.4，取消选择 “Use default compliance settings”，并将 “Generated .class files compatibility” 和 “Source compatibility” 设为 1.4。
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