A.class

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

  public static void main(java.lang.String[]);
    Code:
       0: aconst_null   
       1: invokestatic  #2                  // Method java/lang/String.valueOf:([C)Ljava/lang/String;
       4: pop           
       5: return        
}

A.java

public class A {
    public static void main(String[] args) {
        String.valueOf(null);
    }
}