java中的1L是啥意思?

2019独角兽企业重金招聘Python工程师标准>>> java static final long C0 = 1L; static final long C1 = C0 * 1000L; static final long C2 = C1 * 1000L; static final long C3 = C2 * 1000L; static final long C4 = C3 * 60L; st
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