Java Programming Basics Review Notes unit seventh && Unit eighth

7.1 int[][] triarray{{1},{1,2},{1,2,3},};7.2 array[2].length8.1 Unified Modeling language:umluml class diagramcircle__ ___________radius:double_____________+circle () +circle (newradius:double) Getarea ():d oublecircle1:circle_________ Radius = 198.2client8.3reference Variableclassname Objectrefvar;nullnullpointerexception8.4object member access Operator:.instance variableinstance methodstatic variable:class variablestatic methodgetter:accessorsetter: Mutatorpass by Valuecalling Object8.5java.util.date+date () +date (Elapsetime:long) +tostring (): String+getTime (): Long +settime (Elapsetime:long) void8.6java.util.random+random () +random (Seed:long) +nextint (): Int+nextInt (n:int): int+ Nextlong (): long+nextdouble ():d ouble+nextfloat (): Float+nextboolean (): boolean//random random1 = new Random (3) 8.7javax.swing.jframejframe frame1 = new JFrame () frame1.settitle ("Window 1"); Frame1.setsize (200,150); Frame1.setlocation (200,100); frame1.setdefaultcloseoperation (jframe.exit_on_close); frame1.setVisible (true); JButton Jbtok = New JButton ("OK"); JLabel jlblname = new JLabel ("Enter Your Name:"); JTextField jtfname = new JTextField ("Type in Here"); Jcheckbox jchkbold = new Jcheckbox ("B"); Jradiobutton jrbred = new Jradiobutton ("Red"); JComboBox Jcbocolor = new JComboBox (new string[]{"Freshman", "sophomore", "Junior", "Senior"}); JPanel panel = new JPanel ();p anel.add (Jbtok); 8.8math.pi8.9package-private:package-accessprivate: Member of Class public: Class Keyword:accessor Method:getter Methodactionattributebehaviorclassclientconstructordata Fielddate-field Encapsulationdefault Constructordot operator:object Access Operatorinstanceinstance MethodInstance Variableinstantiationmutator method:setternullno-arg constructorobject-oriented programming:OOPUnified Modeling Language:umlpackage-private:package-accessprivatepropertypublic Reference VariableReference typestatestatic Variablestatic method

　　

Java Programming Basics Review Notes unit seventh && Unit eighth