I have compiled following class using javac 1.6.0_38
class X{
public String m(String a, String b, String c){
return a + b + c;
}
}
and decoupled using javap
class X {
X();
Code:
0: aload_0
1: invokespecial #1 // Method
java/lang/Object."<init>":()V
4: return
public java.lang.String m(java.lang.String, java.lang.String,
java.lang.String);
Code:
0: new #2 // class java/lang/StringBuilder
3: dup
4: invokespecial #3 // Method
java/lang/StringBuilder."<init>":()V
7: aload_1
8: invokevirtual #4 // Method
java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
11: aload_2
12: invokevirtual #4 // Method
java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
15: aload_3
16: invokevirtual #4 // Method
java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
19: invokevirtual #5 // Method
java/lang/StringBuilder.toString:()Ljava/lang/String;
22: areturn
}
As you can see, there are three appends but only one StringBuilder objects.
Therefor I purpose using plus instead of append in our code.
--
With regards,
*Manu*ranga Perera.
phone : 071 7 70 20 50
mail : m...@wso2.com
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