Archive for 1月 4th, 2013

  1. Hello, Java 2D(Jasmin) World!

    Posted on 1月 4th, 2013 by cx20

    Java 2D

    Java 2D は Java による 2D グラフィックライブラリである。
    以下は Jasmin による Java 2D の使用例となっている。

    ソースコード

    Hello.j
    raw download
    ; Produced by NeoJasminVisitor (tinapoc)
; http://tinapoc.sourceforge.net
; The original JasminVisitor is part of the BCEL
; http://jakarta.apache.org/bcel/
; Sun Dec 02 01:34:06 JST 2012
 
.bytecode 50.0
.source Hello.java
.class public Hello
.super javax/swing/JFrame
 
.method public static main([Ljava/lang/String;)V
    .limit stack 3
    .limit locals 2
    .var 0 is arg0 [Ljava/lang/String; from Label0 to Label1
 
    Label0:
.line 8
       0: new Hello
       3: dup
       4: ldc "Hello, World"
       6: invokespecial Hello/<init>(Ljava/lang/String;)V
       9: astore_1
 
    .line 9
      10: aload_1
      11: iconst_1
      12: invokevirtual Hello/setVisible(Z)V
 
    Label1:
.line 10
      15: return
 
.end method
 
.method  <init>(Ljava/lang/String;)V
    .limit stack 3
    .limit locals 3
    .var 0 is this LHello; from Label0 to Label1
    .var 1 is arg0 Ljava/lang/String; from Label0 to Label1
 
    Label0:
.line 13
       0: aload_0
       1: aload_1
       2: invokespecial javax/swing/JFrame/<init>(Ljava/lang/String;)V
 
    .line 14
       5: aload_0
       6: iconst_3
       7: invokevirtual Hello/setDefaultCloseOperation(I)V
 
    .line 15
      10: aload_0
      11: sipush 640
      14: sipush 480
      17: invokevirtual Hello/setSize(II)V
 
    .line 17
      20: new HelloPanel
      23: dup
      24: invokespecial HelloPanel/<init>()V
      27: astore_2
 
    .line 18
      28: aload_0
      29: aload_2
      30: invokevirtual Hello/add(Ljava/awt/Component;)Ljava/awt/Component;
      33: pop
 
    Label1:
.line 19
      34: return
 
.end method
    HelloPanel.j
    raw download
    ; Produced by NeoJasminVisitor (tinapoc)
; http://tinapoc.sourceforge.net
; The original JasminVisitor is part of the BCEL
; http://jakarta.apache.org/bcel/
; Sun Dec 02 01:34:19 JST 2012
 
.bytecode 50.0
.source Hello.java
.class  HelloPanel
.super javax/swing/JPanel
 
.method  <init>()V
    .limit stack 1
    .limit locals 1
    .var 0 is this LHelloPanel; from Label0 to Label1
 
    Label0:
.line 22
       0: aload_0
       1: invokespecial javax/swing/JPanel/<init>()V
 
    Label1:
       4: return
 
.end method
 
.method public paintComponent(Ljava/awt/Graphics;)V
    .limit stack 4
    .limit locals 3
    .var 0 is this LHelloPanel; from Label0 to Label1
    .var 1 is arg0 Ljava/awt/Graphics; from Label0 to Label1
 
    Label0:
.line 24
       0: aload_1
       1: checkcast java/awt/Graphics2D
       4: astore_2
 
    .line 25
       5: aload_2
       6: ldc "Hello, Java2D World!"
       8: iconst_0
       9: bipush 16
      11: invokevirtual java/awt/Graphics2D/drawString(Ljava/lang/String;II)V
 
    Label1:
.line 26
      14: return
 
.end method

    コンパイル＆実行方法

    C:¥> java -jar jasmin.jar Hello.j HelloPanel.j
C:¥> javaw Hello

    実行結果

    +------------------------------------------+
|Hello, World!                    [_][~][X]|
+------------------------------------------+
|Hello, Java 2D World!                     |
|                                          |
|                                          |
|                                          |
|                                          |
|                                          |
|                                          |
|                                          |
|                                          |
|                                          |
+------------------------------------------+