Changing the encoding used to show the source
To change the encoding used by the Java editor to display source files:
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With the Java editor open and the file saved, select Edit > Set Encoding... from the menu bar
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Select Other and then select an encoding from the menu or type in the encoding's name.
Notes:
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This setting affects only the way the source is presented--it does not change the file's contents.
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To change the default encoding used for interpreting text files,
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set the workspace default (Window > Preferences > General > Editors > Text file encoding), or
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set the project- or folder-specific default (Context menu > Properties > Info > Text file encoding)
This will change the encoding of all contained files that don't have an explicit encoding set.

Java editor

Using the Java editor

Edit menu