jvm 变量内存分配-白红宇

jvm 变量内存分配

阅读量：6592 次

发布时间：2019-06-24

本文共 5587 字，大约阅读时间需要 18 分钟。

jvm 变量内存分配博客分类： java jvm

public class T {	// 常量池中分配 String final	private String a = "aa";	// 常量池中分配	final int ee = 22;	// 堆中分配	int ff = 20;	// 超过一定的范围 在常量池中	int ff2 = 200000;			// 堆中分配	Integer i = 4;	// 超过一定的范围 在常量池中	Integer i2 = 444444;	// 堆中分配	final Integer ii = 544;	// 超过一定的范围 在常量池中	final Integer ii2 = 55555;	public void t() {		// 常量池中分配 String final		String b = "bb";		// 常量池中分配		final String c = "cc";		// 栈中分配		int f = 1;		// 超过一定的范围 在常量池中		int f1 = 111111;		// 栈中分配		final int f2 = 33;		// 超过一定的范围 在常量池中		final int f3 = 33333;	}}

const #2 = Asciz        T;const #3 = class        #4;     //  java/lang/Objectconst #4 = Asciz        java/lang/Object;const #5 = Asciz        a;const #6 = Asciz        Ljava/lang/String;;const #7 = Asciz        ee;const #8 = Asciz        I;const #9 = Asciz        ConstantValue;const #10 = int 22;const #11 = Asciz       ff;const #12 = Asciz       ff2;const #13 = Asciz       i;const #14 = Asciz       Ljava/lang/Integer;;const #15 = Asciz       i2;const #16 = Asciz       ii;const #17 = Asciz       ii2;const #18 = Asciz       
     
      ;const #19 = Asciz       ()V;const #20 = Asciz       Code;const #21 = Method      #3.#22; //  java/lang/Object."
      
       ":()Vconst #22 = NameAndType #18:#19;//  "
       
        ":()Vconst #23 = String      #24;    //  aaconst #24 = Asciz       aa;const #25 = Field       #1.#26; //  T.a:Ljava/lang/String;const #26 = NameAndType #5:#6;//  a:Ljava/lang/String;const #27 = Field       #1.#28; //  T.ee:Iconst #28 = NameAndType #7:#8;//  ee:Iconst #29 = Field       #1.#30; //  T.ff:Iconst #30 = NameAndType #11:#8;//  ff:Iconst #31 = int 200000;const #32 = Field       #1.#33; //  T.ff2:Iconst #33 = NameAndType #12:#8;//  ff2:Iconst #34 = Method      #35.#37;        //  java/lang/Integer.valueOf:(I)Lang/Integer;const #35 = class       #36;    //  java/lang/Integerconst #36 = Asciz       java/lang/Integer;const #37 = NameAndType #38:#39;//  valueOf:(I)Ljava/lang/Integer;const #38 = Asciz       valueOf;const #39 = Asciz       (I)Ljava/lang/Integer;;const #40 = Field       #1.#41; //  T.i:Ljava/lang/Integer;const #41 = NameAndType #13:#14;//  i:Ljava/lang/Integer;const #42 = int 444444;const #43 = Field       #1.#44; //  T.i2:Ljava/lang/Integer;const #44 = NameAndType #15:#14;//  i2:Ljava/lang/Integer;const #45 = Field       #1.#46; //  T.ii:Ljava/lang/Integer;const #46 = NameAndType #16:#14;//  ii:Ljava/lang/Integer;const #47 = int 55555;const #48 = Field       #1.#49; //  T.ii2:Ljava/lang/Integer;const #49 = NameAndType #17:#14;//  ii2:Ljava/lang/Integer;const #50 = Asciz       LineNumberTable;const #51 = Asciz       LocalVariableTable;const #52 = Asciz       this;const #53 = Asciz       LT;;const #54 = Asciz       t;const #55 = String      #56;    //  bbconst #56 = Asciz       bb;const #57 = String      #58;    //  ccconst #58 = Asciz       cc;const #59 = int 111111;const #60 = int 33333;const #61 = Asciz       b;const #62 = Asciz       c;const #63 = Asciz       f;const #64 = Asciz       f1;const #65 = Asciz       f2;const #66 = Asciz       f3;const #67 = Asciz       SourceFile;const #68 = Asciz       T.java;{final int ee;  Constant value: int 22int ff;int ff2;java.lang.Integer i;java.lang.Integer i2;final java.lang.Integer ii;final java.lang.Integer ii2;public T();  Code:   Stack=2, Locals=1, Args_size=1   0:   aload_0   1:   invokespecial   #21; //Method java/lang/Object."
        
         ":()V   4:   aload_0   5:   ldc     #23; //String aa   7:   putfield        #25; //Field a:Ljava/lang/String;   10:  aload_0   11:  bipush  22   13:  putfield        #27; //Field ee:I   16:  aload_0   17:  bipush  20   19:  putfield        #29; //Field ff:I   22:  aload_0   23:  ldc     #31; //int 200000   25:  putfield        #32; //Field ff2:I   28:  aload_0   29:  iconst_4   30:  invokestatic    #34; //Method java/lang/Integer.valueOf:(I)Ljava/lteger;   33:  putfield        #40; //Field i:Ljava/lang/Integer;   36:  aload_0   37:  ldc     #42; //int 444444   39:  invokestatic    #34; //Method java/lang/Integer.valueOf:(I)Ljava/lteger;   42:  putfield        #43; //Field i2:Ljava/lang/Integer;   45:  aload_0   46:  sipush  544   49:  invokestatic    #34; //Method java/lang/Integer.valueOf:(I)Ljava/lteger;   52:  putfield        #45; //Field ii:Ljava/lang/Integer;   55:  aload_0   56:  ldc     #47; //int 55555   58:  invokestatic    #34; //Method java/lang/Integer.valueOf:(I)Ljava/lteger;   61:  putfield        #48; //Field ii2:Ljava/lang/Integer;   64:  return  LineNumberTable:   line 1: 0   line 4: 4   line 7: 10   line 9: 16   line 11: 22   line 15: 28   line 17: 36   line 19: 45   line 22: 55   line 1: 64  LocalVariableTable:   Start  Length  Slot  Name   Signature   0      65      0    this       LT;public void t();  Code:   Stack=1, Locals=7, Args_size=1   0:   ldc     #55; //String bb   2:   astore_1   3:   ldc     #57; //String cc   5:   astore_2   6:   iconst_1   7:   istore_3   8:   ldc     #59; //int 111111   10:  istore  4   12:  bipush  33   14:  istore  5   16:  ldc     #60; //int 33333   18:  istore  6   20:  return  LineNumberTable:   line 26: 0   line 28: 3   line 30: 6   line 32: 8   line 34: 12   line 36: 16   line 37: 20  LocalVariableTable:   Start  Length  Slot  Name   Signature   0      21      0    this       LT;   3      18      1    b       Ljava/lang/String;   6      15      2    c       Ljava/lang/String;   8      13      3    f       I   12      9      4    f1       I   16      5      5    f2       I   20      1      6    f3       I}