Lambda表达式

src/shuo/laoma/java8/c91/AnonymousDemo.java

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+package shuo.laoma.java8.c91;
+
+import java.io.File;
+import java.io.FilenameFilter;
+import java.util.Arrays;
+import java.util.Comparator;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+public class AnonymousDemo {
+
+	public static void main(String[] args) {
+		//列出当前目录下的所有后缀为.txt的文件
+		File f = new File(".");
+		File[] files = f.listFiles(new FilenameFilter(){
+		    @Override
+		    public boolean accept(File dir, String name) {
+		        if(name.endsWith(".txt")){
+		            return true;
+		        }
+		        return false;
+		    }
+		});
+
+
+	    Arrays.sort(files, new Comparator<File>() {
+
+	        @Override
+	        public int compare(File f1, File f2) {
+	            return f1.getName().compareTo(f2.getName());
+	        }
+	    });
+
+
+
+	    ExecutorService executor = Executors.newFixedThreadPool(100);
+	    executor.submit(new Runnable() {
+	        @Override
+	        public void run() {
+	            System.out.println("hello world");
+	        }
+	    });
+	}
+
+}

src/shuo/laoma/java8/c91/BasicLambda.java

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+package shuo.laoma.java8.c91;
+
+import java.io.File;
+import java.util.Arrays;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+public class BasicLambda {
+
+	public static void main(String[] args) {
+		File f = new File(".");
+//		File[] files = f.listFiles((File dir, String name) -> {
+//		    if (name.endsWith(".txt")) {
+//		        return true;
+//		    }
+//		    return false;
+//		});
+//		
+//		File[] files = f.listFiles((File dir, String name) -> {
+//		    return name.endsWith(".txt");
+//		});
+//		
+//		File[] files = f.listFiles((File dir, String name) -> name.endsWith(".txt"));
+
+		File[] files = f.listFiles((dir, name) -> name.endsWith(".txt"));
+
+		Arrays.sort(files, (f1, f2) -> f1.getName().compareTo(f2.getName()));
+
+		ExecutorService executor = Executors.newFixedThreadPool(100);
+		executor.submit(()->System.out.println("hello"));
+
+	}
+
+}

src/shuo/laoma/java8/c91/ListUtil.java

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+package shuo.laoma.java8.c91;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.function.Consumer;
+import java.util.function.Function;
+import java.util.function.Predicate;
+
+public class ListUtil {
+
+	static class Student {
+	    String name;
+	    double score;
+
+	    public Student(String name, double score) {
+	        this.name = name;
+	        this.score = score;
+	    }
+
+		public String getName() {
+			return name;
+		}
+
+		public void setName(String name) {
+			this.name = name;
+		}
+
+		public double getScore() {
+			return score;
+		}
+
+		public void setScore(double score) {
+			this.score = score;
+		}
+	}
+
+	public static <E> List<E> filter(List<E> list, Predicate<E> pred) {
+	    List<E> retList = new ArrayList<>();
+	    for (E e : list) {
+	        if (pred.test(e)) {
+	            retList.add(e);
+	        }
+	    }
+	    return retList;
+	}
+
+	public static <T, R> List<R> map(List<T> list, Function<T, R> mapper) {
+	    List<R> retList = new ArrayList<>(list.size());
+	    for (T e : list) {
+	        retList.add(mapper.apply(e));
+	    }
+	    return retList;
+	}
+
+    public static <E> void foreach(List<E> list, Consumer<E> consumer) {
+        for (E e : list) {
+            consumer.accept(e);
+        }
+    }
+
+
+	public static void main(String[] args) {
+		List<Student> students = Arrays.asList(new Student[] {
+		        new Student("zhangsan", 89d),
+		        new Student("lisi", 89d),
+		        new Student("wangwu", 98d) });
+
+		// 过滤90分以上的
+		students = filter(students, t -> t.getScore() > 90);
+
+		//根据学生列表返回名称列表
+		List<String> names = map(students, t -> t.getName());
+
+		//将学生名称转换为大写
+		students = map(students, t -> new Student(t.getName().toUpperCase(), t.getScore()));
+
+		foreach(students, t -> t.setName(t.getName().toUpperCase()));
+	}
+
+}