java

1.JCF(Java Collection Framework)

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2.JVM(Java Virtual Machine)

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3.정적 팩토리 메소드

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4.방어적 복사

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5.동등성과 동일성

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6.Custom Exception

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7.상속

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8.build.gadle

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9.자바의 call by value

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10.String-StringBuilder-StringBuffer

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