Ec Eclipse Overview Luca Della Toffola and Thomas R. Gross - - PowerPoint PPT Presentation
252-0027 Einfhrung in die Programmierung Ec Eclipse Overview Luca Della Toffola and Thomas R. Gross Department Informa:k ETH Zrich To Today Eclipse overview Simple but effec.ve features you may benefit from while developing a program
Luca Della Toffola and Thomas R. Gross
252-0027 Einführung in die Programmierung Department Informa:k ETH Zürich
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Simple but effec.ve features you may benefit from while developing a program
Eclipse overview
Catch your bugs using step-by-step explora.on of your program’s execu.on
Eclipse debugger
Usage of the debugger with “complex” programs that you may develop for this course
Debugging I/O + GUI
You ask I (try to) answer
Ques:ons & answer(s)
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Types and methods view
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Files view
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Set your program’s arguments
Select tab and check next slide
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Write here the program’s arguments
They will be set as the content of the method main parameter String[] args
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Catch your bugs using step-by-step explora7on of your program’s execu7on
Eclipse debugger
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public class Main { public static int maxOf(int[] values) { int res = Integer.MAX_VALUE; for (int i = 0; i < values.length-1; i++) { res = values[i] > res ? values[i] : res; } return res; } public static void main(String[] args) { int[] inputs = readConsole(); System.out.println(maxOf(inputs)); } }
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< 1 < 4 < 10 < 3 > 2147483647
public class Main { public static int maxOf(int[] values) { int res = Integer.MIN_VALUE; for (int i = 0; i < values.length-1; i++) { res = values[i] > res ? values[i] : res; } return res; } public static void main(String[] args) { int[] inputs = readConsole(); System.out.println(maxOf(inputs)); } }
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< 3 < 1 < 4 < 10 > 4
public class Main { public static int maxOf(int[] values) { int res = Integer.MIN_VALUE; for (int i = 0; i < values.length; i++) { res = values[i] > res ? values[i] : res; } return res; } public static void main(String[] args) { int[] inputs = readConsole(); System.out.println(maxOf(inputs)); } }
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< 3 < 1 < 4 < 10 > 10
public class Main { public static int maxOf(int[] values) { int res = Integer.MAX_VALUE; for (int i = 0; i < values.length-1; i++) { res = values[i] > res ? values[i] : res; } return res; } public static void main(String[] args) { int[] inputs = readConsole(); System.out.println(maxOf(inputs)); } }
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maxOf
values res [1, 3, 4, 10] 2147483647
Inspect content of variables and object fields values Pause/resume execu:on
[ Breakpoint]
main
args inputs [] [1, 3, 4, 10]
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Method calls
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Variables inspector
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Program’s I/O console (as before)
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Not needed for now!
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Execution stops when field is accessed/modified
Field watchers
Execu1on stops at method boundaries
Method entry/exit
Execu1on stops when breakpoint is reached
Default
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Write here stopping condition (as a simple program)
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Double-click cell under Value column and write new value
Change primi/ve value
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When value is modified line turns yellow
Change primi,ve value
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Write here expression (as of simple program)
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Rename all usages of a variable at once
Right-click on variable use
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Extract expression to method
Select expression in code + right-click
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Generate constructor from fields
Right-click on field
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Generate constructor from fields
Select fields and then Generate
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Problem 2: y-axis direc/on Problem 1: read data from complex file Problem 3: search the maximum value in linked-list
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… 2004-12-31 01:00:00 13478.0 2004-12-31 02:00:00 12865.0 2004-12-31 03:00:00 12577.0 2004-12-31 04:00:00 12517.0 2004-12-31 05:00:00 12670.0 2004-12-31 06:00:00 13038.0 2004-12-31 07:00:00 13692.0 2004-12-31 08:00:00 14297.0 2004-12-31 09:00:00 14719.0 2004-12-31 10:00:00 14941.0 2004-12-31 11:00:00 15184.0 2004-12-31 14:00:00 14522.0 …
file.csv
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h#ps://cscircles.cemc.uwaterloo.ca/java_visualize/
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