Java 8
——
1.3
Java 8
Java
42
int
3.14
double
new
"abc"
String
new
Integer(1111)
Integer
new HashMap<Integer,String>(100)
——
HashMap
20
60
Java
Java
Java 8
Java
Smalltalk
JavaScript
1.2.1
Lambda
Scala
Groovy
Java 8
Java 8
Stream
Java 8
File
File
isHidden
File
FileFilter
File.listFiles
File[] hiddenFiles = new File(".").listFiles(new FileFilter() {
public boolean accept(File file) {
return file.isHidden();
}
});
“
isHidden
FileFilter
Java 8
Java 8
Java 8