Foo.bytecode

class Foo {
  Foo();
    Code:
       0: aload_0
       1: invokespecial #1                  // Method java/lang/Object."<init>":()V
       4: return

  public boolean isEven(java.lang.Integer);
    Code:
       0: aload_1
       1: invokevirtual #2                  // Method java/lang/Integer.intValue:()I
       4: iconst_2
       5: irem
       6: ifne          13
       9: iconst_1
      10: goto          14
      13: iconst_0
      14: ireturn

  public static void main(java.lang.String[]);
    Code:
       0: new           #3                  // class Foo
       3: dup
       4: invokespecial #4                  // Method "<init>":()V
       7: astore_1
       8: getstatic     #5                  // Field java/lang/System.out:Ljava/io/PrintStream;
      11: bipush        6
      13: anewarray     #6                  // class java/lang/Integer
      16: dup
      17: iconst_0
      18: iconst_1
      19: invokestatic  #7                  // Method java/lang/Integer.valueOf:(I)Ljava/lang/Integer;
      22: aastore
      23: dup
      24: iconst_1
      25: iconst_3
      26: invokestatic  #7                  // Method java/lang/Integer.valueOf:(I)Ljava/lang/Integer;
      29: aastore
      30: dup
      31: iconst_2
      32: bipush        77
      34: invokestatic  #7                  // Method java/lang/Integer.valueOf:(I)Ljava/lang/Integer;
      37: aastore
      38: dup
      39: iconst_3
      40: iconst_4
      41: invokestatic  #7                  // Method java/lang/Integer.valueOf:(I)Ljava/lang/Integer;
      44: aastore
      45: dup
      46: iconst_4
      47: iconst_2
      48: invokestatic  #7                  // Method java/lang/Integer.valueOf:(I)Ljava/lang/Integer;
      51: aastore
      52: dup
      53: iconst_5
      54: bipush        19
      56: invokestatic  #7                  // Method java/lang/Integer.valueOf:(I)Ljava/lang/Integer;
      59: aastore
      60: invokestatic  #8                  // InterfaceMethod java/util/stream/Stream.of:([Ljava/lang/Object;)Ljava/util/stream/Stream;
      63: aload_1
      64: dup
      65: invokevirtual #9                  // Method java/lang/Object.getClass:()Ljava/lang/Class;
      68: pop
      69: invokedynamic #10,  0             // InvokeDynamic #0:test:(LFoo;)Ljava/util/function/Predicate;
      74: invokeinterface #11,  2           // InterfaceMethod java/util/stream/Stream.filter:(Ljava/util/function/Predicate;)Ljava/util/stream/Stream;
      79: invokedynamic #12,  0             // InvokeDynamic #1:applyAsInt:()Ljava/util/function/ToIntFunction;
      84: invokeinterface #13,  2           // InterfaceMethod java/util/stream/Stream.mapToInt:(Ljava/util/function/ToIntFunction;)Ljava/util/stream/IntStream;
      89: invokeinterface #14,  1           // InterfaceMethod java/util/stream/IntStream.sum:()I
      94: invokevirtual #15                 // Method java/io/PrintStream.println:(I)V
      97: return
}

Foo.java

import java.util.stream.Stream;

class Foo {
    public boolean isEven(Integer n) {
        return n % 2 == 0;
    }

    public static void main(String[] args) {
        Foo foo = new Foo();

        System.out.println(Stream.of(1,3,77,4,2,19)
            .filter(foo::isEven)
            .mapToInt(n -> n)
            .sum());
    }
}