关于 Java 字节码的请教

• 这几天翻阅了书籍有些头绪，特来回帖，如果错误望指出

代码

package core.object_create; public class ObjectTest { private String name = "v2"; public void add() { int i10 = -1; int i0 = 5; int i1 = 6; int i2 = 127; int i3 = 150; int sum = i10 + i0 + i1 + i2 + i3; } } 

字节码

public class core/object_create/ObjectTest { private Ljava/lang/String; name // access flags 0x1 public <init>()V L0 LINENUMBER 3 L0 ALOAD 0 //将指定的引用类型本地变量推送至栈顶 INVOKESPECIAL java/lang/Object.<init> ()V //调用超类构造方法，实例初始化方法，私有方法 L1 LINENUMBER 4 L1 ALOAD 0 LDC "v2" //将int, float或String型常量值从常量池中推送至栈顶 PUTFIELD core/object_create/ObjectTest.name : Ljava/lang/String; //为指定的类的实例域赋值 RETURN //从当前方法返回void L2 LOCALVARIABLE this Lcore/object_create/ObjectTest; L0 L2 0 MAXSTACK = 2 //代表了操作数栈（Operand Stacks）深度的最大值 MAXLOCALS = 1 //代表了局部变量表所需的存储空间 // access flags 0x1 public add()V L0 //表示一个局部变量 LINENUMBER 6 L0 //标识变量对应行 ICONST_M1 //将int型-1推送至栈顶 ISTORE 1 //将栈顶int型数值存入指定本地变量 L1 LINENUMBER 7 L1 ICONST_5 //将int型5推送至栈顶 ISTORE 2 L2 LINENUMBER 8 L2 BIPUSH 6 //将单字节的常量值(-128~127)推送至栈顶 ISTORE 3 L3 LINENUMBER 9 L3 BIPUSH 127 ISTORE 4 L4 LINENUMBER 10 L4 SIPUSH 150 ISTORE 5 L5 LINENUMBER 11 L5 ILOAD 1 //将指定的int型本地变量推送至栈顶 ILOAD 2 IADD //将栈顶两int型数值相加并将结果压入栈顶 ILOAD 3 IADD ILOAD 4 IADD ILOAD 5 IADD ISTORE 6 L6 LINENUMBER 12 L6 RETURN L7 LOCALVARIABLE this Lcore/object_create/ObjectTest; L0 L7 0 LOCALVARIABLE i10 I L1 L7 1 LOCALVARIABLE i0 I L2 L7 2 LOCALVARIABLE i1 I L3 L7 3 LOCALVARIABLE i2 I L4 L7 4 LOCALVARIABLE i3 I L5 L7 5 LOCALVARIABLE sum I L6 L7 6 MAXSTACK = 2 MAXLOCALS = 7 }