자바 방법 호출 방법
16105 단어 자바
/*Java ？java I
：java ，
：
，
，
，Java copy（ ）。
copy ， copy ， 。
Java 。
， object = new SomeObject(); ，
copy（ ）， ， 。
*/
package com.zhang;
public class Test6 {
String name = "t";
void change(Test5 t2) {
};
void change2(Test5 t2) {
t2 = new Test5();
};
public static void main(String[] args) {
Test5 t = new Test5();
Test5 t2 = t;
/*
* // t2 copy . change(Test5 t2)。 t2.name =
* "hao"; t2 name ，t name 。 。t, t2。 new
* Test5(); 。 change(Test5 t2){t2 = new Test5();}
* t2 change(Test5 t2){t2 = new Test5();}
* ， t2， t。 ， t2 ， t 。
* change(Test5 t2){t2 = new Test5();} 。t2.name “ ”
*/
System.out.println(t.name);
}
}
/*
* *Compiled from "Test5.java" public
*
* class Test5 extends java.lang.Object SourceFile: "Test5.java" minor
*
* version: 0 major version: 50 Constant pool: const #1 = Method #9.#20;
*
* // java/lang/Object."<init>":()V const #2 = String #21; // t const #3 =
*
* Field #4.#22; // Test5.name:Ljava/lang/String; const #4 = class #23; //
*
* Test5 const #5 = Method #4.#20; // Test5."<init>":()V const #6 = String
*
* #24; // hao const #7 = Field #25.#26; //
*
* java/lang/System.out:Ljava/io/PrintS tream; const #8 = Method #27.#28;
*
* // java/io/PrintStream.println:(Ljava/l ang/String;)V const #9 = class
*
* #29; // java/lang/Object const #10 = Asciz name; const #11 = Asciz
*
* Ljava/lang/String;; const #12 = Asciz <init>; const #13 = Asciz ()V;
*
* const #14 = Asciz Code; const #15 = Asciz LineNumberTable; const #16 =
*
* Asciz main; const #17 = Asciz ([Ljava/lang/String;)V; const #18 = Asciz
*
* SourceFile; const #19 = Asciz Test5.java; const #20 = NameAndType
*
* #12:#13;// "<init>":()V const #21 = Asciz t; const #22 = NameAndType
*
* #10:#11;// name:Ljava/lang/String; const #23 = Asciz Test5; const #24 =
*
* Asciz hao; const #25 = class #30; // java/lang/System const #26 =
*
* NameAndType #31:#32;// out:Ljava/io/PrintStream; const #27 = class #33;
*
* // java/io/PrintStream const #28 = NameAndType #34:#35;// println:
*
* (Ljava/lang/String;)V const #29 = Asciz java/lang/Object; const #30 =
*
* Asciz java/lang/System; const #31 = Asciz out; const #32 = Asciz
*
* Ljava/io/PrintStream;; const #33 = Asciz java/io/PrintStream; const #34
*
* = Asciz println; const #35 = Asciz (Ljava/lang/String;)V; {
*
* java.lang.String name; public Test5(); Code: Stack=2, Locals=1,
*
* Args_size=1 0: aload_0 1: invokespecial #1; //Method
*
* java/lang/Object."<init>":()V 4: aload_0 5: ldc #2; //String t 7:
*
* putfield #3; //Field name:Ljava/lang/String; 10: return
*
* LineNumberTable: line 1: 0 line 2: 4 public static void main
*
* (java.lang.String[]); Code: Stack=2, Locals=3, Args_size=1 0: new #4;
*
* //class Test5 ， 3: dup //// ，
*
* 4: invokespecial #5; //Method "<init>":()V 7: astore_1
*
* //// （ ） 8: aload_1 //
*
* 9: astore_2 //
*
* （ ） 10: aload_2 //
*
* 11: ldc #6; //String hao string hao ，
*
* 13: putfield #3; //Field name:Ljava/lang/String;// name
*
* 16: getstatic #7; //Field java/lang/System.out:Ljava/io/PrintStream;
*
* 19: aload_1 // (13
*
* name ) 20: getfield #3; //Field name:Ljava/lang/String; //
*
* name。 23: invokevirtual #8; //Method
*
* java/io/PrintStream.println:(Ljava/lang/Str ing;)V 26: return
*
* LineNumberTable: line 4: 0 line 5: 8 line 6: 10 line 7: 16 line 8: 26 }
*/
package com.zhang;
public class Test{
public static void changeStr(String str){
str="welcome";
}
public static void main(String[] args) {
String str="1234";
changeStr(str);
System.out.println(str);
}
}
/*
* Compiled from "Test.java"
public class Test extends java.lang.Object
SourceFile: "Test.java"
minor version: 0
major version: 50
Constant pool:
const #1 = Method #8.#19; // java/lang/Object."":()V
const #2 = String #20; // welcome
const #3 = String #21; // 1234
const #4 = Method #7.#22; // Test.changeStr:(Ljava/lang/String;)V
const #5 = Field #23.#24; // java/lang/System.out:Ljava/io/PrintS
tream;
const #6 = Method #25.#26; // java/io/PrintStream.println:(Ljava/l
ang/String;)V
const #7 = class #27; // Test
const #8 = class #28; // java/lang/Object
const #9 = Asciz ;
const #10 = Asciz ()V;
const #11 = Asciz Code;
const #12 = Asciz LineNumberTable;
const #13 = Asciz changeStr;
const #14 = Asciz (Ljava/lang/String;)V;
const #15 = Asciz main;
const #16 = Asciz ([Ljava/lang/String;)V;
const #17 = Asciz SourceFile;
const #18 = Asciz Test.java;
const #19 = NameAndType #9:#10;// "":()V
const #20 = Asciz welcome;
const #21 = Asciz 1234;
const #22 = NameAndType #13:#14;// changeStr:(Ljava/lang/String;)V
const #23 = class #29; // java/lang/System
const #24 = NameAndType #30:#31;// out:Ljava/io/PrintStream;
const #25 = class #32; // java/io/PrintStream
const #26 = NameAndType #33:#14;// println:(Ljava/lang/String;)V
const #27 = Asciz Test;
const #28 = Asciz java/lang/Object;
const #29 = Asciz java/lang/System;
const #30 = Asciz out;
const #31 = Asciz Ljava/io/PrintStream;;
const #32 = Asciz java/io/PrintStream;
const #33 = Asciz println;
{
public Test();
Code:
Stack=1, Locals=1, Args_size=1
0: aload_0
1: invokespecial #1; //Method java/lang/Object."":()V
4: return
LineNumberTable:
line 1: 0
public static void changeStr(java.lang.String);
Code:
Stack=1, Locals=1, Args_size=1
0: ldc #2; //String welcome 은 string welcome 상수 를 상수 탱크 에서 꺼 내 창고 꼭대기 로 밀어 넣 습 니 다.
2: astore_0//스 택 맨 위 참조 형식 수 치 를 첫 번 째 로 컬 변수(부분 변수 표)에 저장 합 니 다.
3: return
LineNumberTable:
line 3: 0
line 4: 3
public static void main(java.lang.String[]);
Code:
Stack=2, Locals=2, Args_size=1
0: ldc #3; //String 1234 string 1234 상 수 를 상수 탱크 에서 꺼 내 창고 꼭대기 로 밀어 넣 습 니 다.
2: astore_1//스 택 맨 위 참조 형식 수 치 를 두 번 째 로 컬 변수(부분 변수 표)에 저장 합 니 다.
3: aload_1//두 번 째 인용 형식 로 컬 변 수 를 스 택 맨 위로 보 냅 니 다.
4: invokestatic #4; //Method changeStr:(Ljava/lang/String;)V
7: getstatic #5; //Field java/lang/System.out:Ljava/io/PrintStream;
10: aload_1//두 번 째 인용 형식 로 컬 변 수 를 스 택 맨 위로 보 냅 니 다.
11: invokevirtual #6; //Method java/io/PrintStream.println:(Ljava/lang/Str
ing;)V
14: return
LineNumberTable:
line 6: 0
line 7: 3
line 8: 7
line 9: 14
}
* */
package com.zhang;
public class Test2{
public static void changeStr(String str){
str="welcome";
}
public static void main(String[] args) {
String str="1234";
str = "welcome";
// changeStr(str);
System.out.println(str);
}
}
/**
*Compiled from "Test2.java"
public class Test2 extends java.lang.Object
SourceFile: "Test2.java"
minor version: 0
major version: 50
Constant pool:
const #1 = Method #7.#18; // java/lang/Object."<init>":()V
const #2 = String #19; // welcome
const #3 = String #20; // 1234
const #4 = Field #21.#22; // java/lang/System.out:Ljava/io/PrintS
tream;
const #5 = Method #23.#24; // java/io/PrintStream.println:(Ljava/l
ang/String;)V
const #6 = class #25; // Test2
const #7 = class #26; // java/lang/Object
const #8 = Asciz <init>;
const #9 = Asciz ()V;
const #10 = Asciz Code;
const #11 = Asciz LineNumberTable;
const #12 = Asciz changeStr;
const #13 = Asciz (Ljava/lang/String;)V;
const #14 = Asciz main;
const #15 = Asciz ([Ljava/lang/String;)V;
const #16 = Asciz SourceFile;
const #17 = Asciz Test2.java;
const #18 = NameAndType #8:#9;// "<init>":()V
const #19 = Asciz welcome;
const #20 = Asciz 1234;
const #21 = class #27; // java/lang/System
const #22 = NameAndType #28:#29;// out:Ljava/io/PrintStream;
const #23 = class #30; // java/io/PrintStream
const #24 = NameAndType #31:#13;// println:(Ljava/lang/String;)V
const #25 = Asciz Test2;
const #26 = Asciz java/lang/Object;
const #27 = Asciz java/lang/System;
const #28 = Asciz out;
const #29 = Asciz Ljava/io/PrintStream;;
const #30 = Asciz java/io/PrintStream;
const #31 = Asciz println;
{
public Test2();
Code:
Stack=1, Locals=1, Args_size=1
0: aload_0
1: invokespecial #1; //Method java/lang/Object."<init>":()V
4: return
LineNumberTable:
line 1: 0
public static void changeStr(java.lang.String);
Code:
Stack=1, Locals=1, Args_size=1
0: ldc #2; //String welcome string welcome ，
2: astore_0 // （ ）
3: return
LineNumberTable:
line 3: 0
line 4: 3
public static void main(java.lang.String[]);
Code:
Stack=2, Locals=2, Args_size=1
0: ldc #3; //String 1234 string 1234 ，
2: astore_1 // （ ）
3: ldc #2; //String welcome string welcome ，
5: astore_1 // （ ）
6: getstatic #4; //Field java/lang/System.out:Ljava/io/PrintStream;
9: aload_1 //
10: invokevirtual #5; //Method java/io/PrintStream.println:(Ljava/lang/Str
ing;)V
13: return
LineNumberTable:
line 6: 0
line 7: 3
line 9: 6
line 10: 13
}
*
**/
package com.zhang;
public class Test4{
public static void changeStr(T str){
str.name = "sf";
}
public static void main(String[] args) {
T t = new T();
changeStr(t);
System.out.println(t.name);
}
}
class T{
String name = "name--min";
@Override
public String toString() {
// TODO Auto-generated method stub
return name;
}
}
/*
*Compiled from "Test4.java"
public class Test4 extends java.lang.Object
SourceFile: "Test4.java"
minor version: 0
major version: 50
Constant pool:
const #1 = Method #10.#21; // java/lang/Object."<init>":()V
const #2 = String #22; // sf
const #3 = Field #4.#23; // T.name:Ljava/lang/String;
const #4 = class #24; // T
const #5 = Method #4.#21; // T."<init>":()V
const #6 = Method #9.#25; // Test4.changeStr:(LT;)V
const #7 = Field #26.#27; // java/lang/System.out:Ljava/io/Print
tream;
const #8 = Method #28.#29; // java/io/PrintStream.println:(Ljava/
ang/String;)V
const #9 = class #30; // Test4
const #10 = class #31; // java/lang/Object
const #11 = Asciz <init>;
const #12 = Asciz ()V;
const #13 = Asciz Code;
const #14 = Asciz LineNumberTable;
const #15 = Asciz changeStr;
const #16 = Asciz (LT;)V;
const #17 = Asciz main;
const #18 = Asciz ([Ljava/lang/String;)V;
const #19 = Asciz SourceFile;
const #20 = Asciz Test4.java;
const #21 = NameAndType #11:#12;// "<init>":()V
const #22 = Asciz sf;
const #23 = NameAndType #32:#33;// name:Ljava/lang/String;
const #24 = Asciz T;
const #25 = NameAndType #15:#16;// changeStr:(LT;)V
const #26 = class #34; // java/lang/System
const #27 = NameAndType #35:#36;// out:Ljava/io/PrintStream;
const #28 = class #37; // java/io/PrintStream
const #29 = NameAndType #38:#39;// println:(Ljava/lang/String;)V
const #30 = Asciz Test4;
const #31 = Asciz java/lang/Object;
const #32 = Asciz name;
const #33 = Asciz Ljava/lang/String;;
const #34 = Asciz java/lang/System;
const #35 = Asciz out;
const #36 = Asciz Ljava/io/PrintStream;;
const #37 = Asciz java/io/PrintStream;
const #38 = Asciz println;
const #39 = Asciz (Ljava/lang/String;)V;
{
public Test4();
Code:
Stack=1, Locals=1, Args_size=1
0: aload_0
1: invokespecial #1; //Method java/lang/Object."<init>":()V
4: return
LineNumberTable:
line 1: 0
public static void changeStr(T);
Code:
Stack=2, Locals=1, Args_size=1
0: aload_0 //// （ ）
1: ldc #2; //String sf string sf ，
3: putfield #3; //Field T.name:Ljava/lang/String;// t name
6: return
LineNumberTable:
line 3: 0
line 4: 6
public static void main(java.lang.String[]);
Code:
Stack=2, Locals=2, Args_size=1
0: new #4; //class T ，
3: dup // ，
4: invokespecial #5; //Method T."<init>":()V
7: astore_1 // （ ）
8: aload_1 //
9: invokestatic #6; //Method changeStr:(LT;)V
12: getstatic #7; //Field java/lang/System.out:Ljava/io/PrintStream;
15: aload_1 //
16: getfield #3; //Field T.name:Ljava/lang/String; // name。
19: invokevirtual #8; //Method java/io/PrintStream.println:(Ljava/lang/St
ing;)V
22: return
LineNumberTable:
line 7: 0
line 8: 8
line 9: 12
line 10: 22
}
* */
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