Description: java mutually exclusive two-process synchronization problem, a file write a file to play, play is complete, delete this file, to read another file, this also write to this file.
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two thread\.classpath
..........\.project
..........\.settings\org.eclipse.jdt.core.prefs
..........\bin\Demo1$1.class
..........\...\Demo1$2.class
..........\...\Demo1$3.class
..........\...\Demo1.class
..........\src\Demo1.java
..........\.settings
..........\bin
..........\src
two thread