checker/tests/nullness/VarargsNullness.java

import org.checkerframework.checker.nullness.qual.*;

public class VarargsNullness {

  public void test(@NonNull Object @NonNull ... o) {
    for (@NonNull Object p : o) {
      System.out.println(p);
    }
  }

  public void test2(Object o1, Object o2) {
    System.out.println(o1);
    System.out.println(o2);
  }

  public void testVarargs() {
    test("foo", "bar", "baz");
  }

  public void testVarargsNoArgs() {
    test();
  }

  public void testNonVarargs() {
    test2("foo", "bar");
  }

  public void format1(java.lang.String a1, java.lang.@Nullable Object... a2) {
    int x = a2.length; // no warning
    // :: error: (enhancedfor)
    for (@NonNull Object p : a2) // warning
    System.out.println(p);
  }

  public void format2(java.lang.String a1, java.lang.Object @Nullable ... a2) {
    // :: error: (dereference.of.nullable)
    int x = a2.length; // warning
    for (@NonNull Object p : a2) // no warning
    System.out.println(p);
  }

  public void testPrintf() {
    String s = null;
    printf("%s", s);
    // tests do not use annotated JDK
    // System.out.printf ("%s", s);
  }

  // printf declaration is taken from PrintStream
  public java.io.PrintStream printf(java.lang.String a1, java.lang.@Nullable Object... a2) {
    throw new RuntimeException("skeleton method");
  }
}