gistfile1.txt

public class Test {
	public static void main(String[] args) {
		String b = "b";
		System.out.println("A" + b + "C");
	}
}

$ javap -c Test
Compiled from "Test.java"
public class Test {
  public 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: ldc           #2                  // String b
       2: astore_1
       3: getstatic     #3                  // Field java/lang/System.out:Ljava/io/PrintStream;
       6: new           #4                  // class java/lang/StringBuilder
       9: dup
      10: invokespecial #5                  // Method java/lang/StringBuilder."<init>":()V
      13: ldc           #6                  // String A
      15: invokevirtual #7                  // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
      18: aload_1
      19: invokevirtual #7                  // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
      22: ldc           #8                  // String C
      24: invokevirtual #7                  // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
      27: invokevirtual #9                  // Method java/lang/StringBuilder.toString:()Ljava/lang/String;
      30: invokevirtual #10                 // Method java/io/PrintStream.println:(Ljava/lang/String;)V
      33: return
}