Java. Massimo Dong. November 27, Massimo Dong Java November 27, / 26
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1 Java Massimo Dong November 27, 2017 Massimo Dong Java November 27, / 26
2 Outline 1 The Java Language Java Virtual Machine(JVM) 2 Java Memory Management References & Garbage Collection Array Check *Heartbleed 3 Compile & Run Time Check Exceptions Type Safety Modifiers Undefined Behaviors 4 Java Rich Internet Applications Web Start Applications Sandbox Security Manager Signing Massimo Dong Java November 27, / 26
3 Java Virtual Machine(JVM) Massimo Dong Java November 27, / 26
4 Outline 1 The Java Language Java Virtual Machine(JVM) 2 Java Memory Management References & Garbage Collection Array Check *Heartbleed 3 Compile & Run Time Check Exceptions Type Safety Modifiers Undefined Behaviors 4 Java Rich Internet Applications Web Start Applications Sandbox Security Manager Signing Massimo Dong Java November 27, / 26
5 References vs Pointers Java ProblemSolving ref = new ProblemSolving();... C++ ProblemSolving *ptr = new ProblemSolving;... delete ptr; Massimo Dong Java November 27, / 26
6 Java Reference Java static void foo(problemsolving ref){ ref.ud = 2; public static void main(string[] argv){ ProblemSolving ref = new ProblemSolving(); foo(ref); System.out.println(ref.UD); Massimo Dong Java November 27, / 26
7 Java Reference Java static void foo(problemsolving ref){ ref.ud = 2; public static void main(string[] argv){ ProblemSolving ref = new ProblemSolving(); foo(ref); System.out.println(ref.UD); 2 Massimo Dong Java November 27, / 26
8 Java Arrays An object is a class instance or an array. Massimo Dong Java November 27, / 26
9 Java Arrays An object is a class instance or an array. Java public class ArrayDemo{ public static void main(string[] argv){ int[] A = new int[10]; System.out.println(A instanceof Object); Massimo Dong Java November 27, / 26
10 Java Arrays An object is a class instance or an array. Java public class ArrayDemo{ public static void main(string[] argv){ int[] A = new int[10]; System.out.println(A instanceof Object); true Massimo Dong Java November 27, / 26
11 Array Check Java public class ArrayDemo{ public static void main(string[] argv){ int[] A = new int[10]; System.out.println(A[233]); Massimo Dong Java November 27, / 26
12 Array Check Java public class ArrayDemo{ public static void main(string[] argv){ int[] A = new int[10]; System.out.println(A[233]); Exception in thread "main" java.lang.arrayindexoutofboundsexception: 233 at ArrayDemo.main(ArrayDemo.java:4) Massimo Dong Java November 27, / 26
13 Heartbleed Massimo Dong Java November 27, / 26
14 Heartbleed Massimo Dong Java November 27, / 26
15 Heartbleed Massimo Dong Java November 27, / 26
16 Heartbleed C/C++ memcpy(bp, pl, payload); Massimo Dong Java November 27, / 26
17 Heartbleed C/C++ memcpy(bp, pl, payload); pl = "ProblemSolving" payload = 64 * 1024; Massimo Dong Java November 27, / 26
18 Massimo Dong Java November 27, / 26
19 Massimo Dong Java November 27, / 26
20 Outline 1 The Java Language Java Virtual Machine(JVM) 2 Java Memory Management References & Garbage Collection Array Check *Heartbleed 3 Compile & Run Time Check Exceptions Type Safety Modifiers Undefined Behaviors 4 Java Rich Internet Applications Web Start Applications Sandbox Security Manager Signing Massimo Dong Java November 27, / 26
21 Exceptions Java public static void main(string[] argv){ FileInputStream in = new FileInputStream("data.in"); Massimo Dong Java November 27, / 26
22 Exceptions Java public static void main(string[] argv){ FileInputStream in = new FileInputStream("data.in"); error: unreported exception FileNotFoundException; must be caught or declared to be thrown FileInputStream in = new FileInputStream("data.in"); ^ Massimo Dong Java November 27, / 26
23 Exceptions Java try{ FileInputStream in = new FileInputStream("data.in"); catch(filenotfoundexception E){ System.out.println("File Not Found!"); Massimo Dong Java November 27, / 26
24 Exceptions Java try{ FileInputStream in = new FileInputStream("data.in"); catch(filenotfoundexception E){ System.out.println("File Not Found!"); Java public static void main(string[] argv) throws FileNotFoundException{ FileInputStream in = new FileInputStream("data.in"); Massimo Dong Java November 27, / 26
25 Type Safety C int main(){ void (*foo)(); foo = 233; foo(); Massimo Dong Java November 27, / 26
26 Type Safety C int main(){ void (*foo)(); foo = 233; foo(); warning: assignment makes pointer from integer without a cast foo = 233; ^ Massimo Dong Java November 27, / 26
27 Type Safety Java public static void main(string[] argv){ A a; B b; a = b; C int main(){ struct A *a; struct B *b; a = b; Massimo Dong Java November 27, / 26
28 Modifiers Access Modifiers private public protected Non Access Modifiers static final abstract synchronized and volatile Massimo Dong Java November 27, / 26
29 Java public static void main(string[] argv){ final int a; a = 39; Massimo Dong Java November 27, / 26
30 Java public static void main(string[] argv){ final int a; a = 39; public static void main(string[] argv){ final int a; a = 39; a = 40; Massimo Dong Java November 27, / 26
31 Java public static void main(string[] argv){ final int a; a = 39; public static void main(string[] argv){ final int a; a = 39; a = 40; error: variable a might already have been assigned Massimo Dong Java November 27, / 26
32 Undefined Behaviors Massimo Dong Java November 27, / 26
33 Undefined Behaviors C i = i++ + 1; Massimo Dong Java November 27, / 26
34 Undefined Behaviors C i = i++ + 1; Undefined Behavior Massimo Dong Java November 27, / 26
35 Undefined Behaviors C i = i++ + 1; Undefined Behavior Java i = i++ + 1; Massimo Dong Java November 27, / 26
36 Undefined Behaviors C i = i++ + 1; Undefined Behavior Java i = i++ + 1; 1 Massimo Dong Java November 27, / 26
37 Outline 1 The Java Language Java Virtual Machine(JVM) 2 Java Memory Management References & Garbage Collection Array Check *Heartbleed 3 Compile & Run Time Check Exceptions Type Safety Modifiers Undefined Behaviors 4 Java Rich Internet Applications Web Start Applications Sandbox Security Manager Signing Massimo Dong Java November 27, / 26
38 Web Start Applications Demo Massimo Dong Java November 27, / 26
39 Sandbox Massimo Dong Java November 27, / 26
40 Sandbox Java try{ FileInputStream in = new FileInputStream("input.txt"); catch(exception E){ System.out.println(E); Massimo Dong Java November 27, / 26
41 Sandbox Java try{ FileInputStream in = new FileInputStream("input.txt"); catch(exception E){ System.out.println(E); java.security.accesscontrolexception: access denied ("java.io.filepermission" "input.txt" "read") Massimo Dong Java November 27, / 26
42 Security Manager Java SecurityManager security = System.getSecurityManager(); if(security!= null){ try{ security.checkread("input.txt"); catch(exception E){ System.out.println(E); return; Massimo Dong Java November 27, / 26
43 Security Manager Java SecurityManager security = System.getSecurityManager(); if(security!= null){ try{ security.checkread("input.txt"); catch(exception E){ System.out.println(E); return; $javaws -nosecurity demo_no_codebase.jnlp Massimo Dong Java November 27, / 26
44 Signing Massimo Dong Java November 27, / 26
45 Signing Demo Massimo Dong Java November 27, / 26
46 References Massimo Dong Java November 27, / 26
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