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JDK8的时间API怎么计算三天打渔，两天晒网，某一天在干什么的问题？
自己写了一个JDK8之前的，但是JDK8之后的不太懂。
package date;
import java.text.ParseException;
import java.text.Simpl
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DateTimeFormatter (Java Platform SE 8 ) - Oracle Help Center
A formatter created from a pattern can be used as many times as necessary, it is immutable and is thread-safe.