confuse.java

                                                                                          
 max@antonov :~: 22:41:32 [0] $ cat Ti.java                                                             
                                                                                                        
class Ti{                                                                                               
public static String a="test";                                                                          
public static String b="Yes";                                                                           
public static void main(String [] args){                                                                
StringBuilder c =  new StringBuilder();                                                                 
c.append(a); c.append(" "); c.append(b);
System.out.println(c);
}
}
 max@antonov :~: 22:43:11 [0] $ cat Test.java 

class Test{
public static String a="test";
public static String b="Yes";
public static void main(String [] args){
String c = a+" "+b;
System.out.println(c);
}
}
 max@antonov :~: 22:43:18 [0] $ javap -c Ti
Compiled from "Ti.java"
class Ti {
  public static java.lang.String a;

  public static java.lang.String b;

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

  public static void main(java.lang.String[]);
    Code:
       0: new           #2                  // class java/lang/StringBuilder
       3: dup           
       4: invokespecial #3                  // Method java/lang/StringBuilder."<init>":()V
       7: astore_1      
       8: aload_1       
       9: getstatic     #4                  // Field a:Ljava/lang/String;
      12: invokevirtual #5                  // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
      15: pop           
      16: aload_1       
      17: ldc           #6                  // String  
      19: invokevirtual #5                  // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
      22: pop           
      23: aload_1       
      24: getstatic     #7                  // Field b:Ljava/lang/String;
      27: invokevirtual #5                  // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
      30: pop           
      31: getstatic     #8                  // Field java/lang/System.out:Ljava/io/PrintStream;
      34: aload_1       
      35: invokevirtual #9                  // Method java/io/PrintStream.println:(Ljava/lang/Object;)V
      38: return        

  static {};
    Code:
       0: ldc           #10                 // String test
       2: putstatic     #4                  // Field a:Ljava/lang/String;
       5: ldc           #11                 // String Yes
       7: putstatic     #7                  // Field b:Ljava/lang/String;
      10: return        
}
 max@antonov :~: 22:43:35 [0] $ javap -c Test
Compiled from "Test.java"
class Test {
  public static java.lang.String a;

  public static java.lang.String b;

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

  public static void main(java.lang.String[]);
    Code:
       0: new           #2                  // class java/lang/StringBuilder
       3: dup           
       4: invokespecial #3                  // Method java/lang/StringBuilder."<init>":()V
       7: getstatic     #4                  // Field a:Ljava/lang/String;
      10: invokevirtual #5                  // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
      13: ldc           #6                  // String  
      15: invokevirtual #5                  // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
      18: getstatic     #7                  // Field b:Ljava/lang/String;
      21: invokevirtual #5                  // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
      24: invokevirtual #8                  // Method java/lang/StringBuilder.toString:()Ljava/lang/String;
      27: astore_1      
      28: getstatic     #9                  // Field java/lang/System.out:Ljava/io/PrintStream;
      31: aload_1       
      32: invokevirtual #10                 // Method java/io/PrintStream.println:(Ljava/lang/String;)V
      35: return        

  static {};
    Code:
       0: ldc           #11                 // String test
       2: putstatic     #4                  // Field a:Ljava/lang/String;
       5: ldc           #12                 // String Yes
       7: putstatic     #7                  // Field b:Ljava/lang/String;
      10: return        
}
 max@antonov :~: 22:43:41 [0] $ javap -c Ti|wc -l
43
 max@antonov :~: 22:43:51 [0] $ javap -c Test|wc -l
38