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| 5. 27. 1. 最后变量 |
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You can prefix a variable declaration with the keyword final to make its value unchangeable.
You can make both local variables and class fields final. |
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final int numberOfMonths = 12;
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- Once assigned a value, the final value cannot change.
- Attempting to change it will result in a compile error.
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final float pi = (float) 22 / 7;
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The casting (float) after 22 / 7 is needed to convert the value of division to float.
Otherwise, an int will be returned and the pi variable will have a value of 3.0, instead of 3.1428. |
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