java8 常用函数式接口

　　

 

　　

 

public static void main(String[] args) {
        // TODO Auto-generated method stub
        //函数式接口
        
        Function<Integer, String[]> f=x->new String[x];
        String[] strs=f.apply(10);
        System.out.println(strs.length);    //10
        
        Runnable r=()->System.out.println("Runnable接口");
        r.run();      //Runnable接口
        
        Supplier<Integer> s=()->{
            Integer i=100;
            //.....
            return i;
        };
        System.out.println(s.get());    //100
        
        
        Consumer<Double> c=d->{
            System.out.println(d);
        };
        c.accept(100.001);  //100.001
        
        
        BiConsumer<Integer,String[]> b=(a,st)->{
            System.out.println(a);
            for(int i=0;i<st.length;i++){
                st[i]=st[i].toUpperCase();
                System.out.print(st[i]+"    ");
            }
            System.out.println();
        };
        String[] sts=new String[]{"hello","world"};
        b.accept(99, sts);   //HELLO    WORLD   
        
        BiFunction<Integer, Double, String> bi=(one,second)->{
            String sone=""+one+second;
            return sone;
        };
        System.out.println(bi.apply(123, 456.789));   //123456.789
        
    }