Open Eclipse and find the menu bar window-preferences
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On the left side of the open window, locate general-appearance-colors and Fonts
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On the right side of the window, you can set a specific language, in the Java language, for example, expand Java, select "Java Editor Text Font", click the "Edit" button on the right
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In the Font settings page, you can set the font size and style, after the settings are complete, click OK to save it.
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How Eclipse modifies font size