Effective Java
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Effective Java for Android presentation on Onboarding 2016
Effective Java
- 1. Effective Java for Mobile 亳亳仍仍 仂亰仂于
- 2. 亞舒仆亳亠仆亳 仄仂弍亳仍仆 仂亶于 仂亠仂 RAM 舒仄 舒舒亠亶从舒 亠舒弍亳仍仆亶 亳亞仆舒仍
- 3. 仗仂仍亰亶亠 仂仍仂亢亠仆仆仂亠 (lazy) 仗仂仍亠仆亳亠 仍仂亢仆 亟舒仆仆, 仂仍从仂 于 仂 仄仂仄亠仆 从仂亞亟舒 仂仆亳 于舒仄 仗仂仆舒亟仂弍
- 4. 仗仂仍亰亶亠 从 亟仍 亠亰仍舒仂于 仍仂亢仆 于亳仍亠仆亳亶 从仂仂亠 仗仂仆舒亟仂弍 于舒仄 仆亠从仂仍从仂 舒亰
- 6. 亠 亳仗仂仍亰仂于舒 仄舒亳于 亟舒仆仆 仗亳仄亳亳于仆仂亞仂 亳仗舒, 亠仄 仄舒亳于 亳仗仂于-仂弍亠仂从
- 7. 亠 亳仗仂仍亰亶亠 static 于仄亠仂 virtual
- 8. 亰弍亠亞舒亶亠 亳仗仂仍亰仂于舒仆亳亠 Getter-仂于/ Setter-仂于 于仆亳 从仍舒仂于 亠亰 JIT 亟仂仗 从 仗仂仍礆 仆舒仗礆 于 3 舒亰舒 弍亠亠 弌 JIT - 于 7 舒亰
- 9. public class Foo { private class Inner { void stuff() { Foo.this.doStuff(Foo.this.mValue); } } private int mValue; public void run() { Inner in = new Inner(); mValue = 27; in.stuff(); } private void doStuff(int value) { System.out.println("Value is " + value); } }
- 10. 仗仂仍亰亶亠 仄仂亟亳亳从舒仂 亟仂仗舒 仗仂 仄仂仍舒仆亳 于仄亠仂 private 于 仍舒亠 从仂亞亟舒 仗仂亳仂亟亳 仂弍舒亠仆亳 从 仍亠仄亠仆舒仄 亳亰 于仆亠仆仆亳 从仍舒仂于
- 11. List<String> strings = Arrays.asList("one", "two", "three"); // Indexed for for (int i = 0; i < strings.size(); i++) { System.out.println(strings.get(i)); } // Optimized indexed for for (int i = 0, count = strings.size(); i < count; i++) { System.out.println(strings.get(i)); } //Iterator for (String item : strings) { System.out.println(item); } //Collection Stream API strings.forEach(System.out::println);
- 13. 亠 仂亰亟舒于舒亶亠 仂弍亠从 于 亳仆亠仆亳于仆仂 于亰于舒亠仄仂仄 从仂亟亠
- 14. 弌舒舒亶亠 仂仍仂亢亳 亰舒亟舒亳 从仂亞亟舒 仂亶于仂 弍亟亠 亳仄亠 弍仂仍亠 亠仂于 于 于仂亠仄 舒仗仂礀亠仆亳亠