Unit 2

• Shortcut operators
• x+=2; x=x+2;
• y-=5; y=y-5;
• z*=value; z=z*vlaue;
• a/=10; a=a/10;
• num%=2; num=num%2;
• x++; x=x=1;
• x--; x=x-1;
• Random numbers
• Random randy=new Random();
• int x=randy.next(z);
• if z is left blank, will give a number within the systems limits
• if z is a number it is 0 to z-1 inclusive or (high-low+1)+low
• doubl nextDouble(); returns between 0.0(inclusive) to 1.0(exclusive)
• Control sutructures
• if(boolean condition){executable statement(s)}
• if/else gives the option for an alternate set of instructions
• for loop is a reparition structure("fixed")
• for(initialize counter; test condition; update counter){executable statement(s)}
• while loop will run maby times or not at all, due to a pre loop condition check, once not true it is terminated
• while(boolean conditon)
• must change the control variable with in the loop
• do/while loop the condition is checked at the end, so it will always run at least once
• do{ executable statements; }while(boolean condition);
• switch statement has an unlimited number of options
• switch(variable){
case value1: executable statement(s);
break;
• nesting is placing a loop inside of another loop
• Relational operators
• > greater than
• < less than
• >= greater or equal to
• <= less or equal to
• == equal to
• != not equal to
• Compound boolean statements
• && and
• || or
• new order of operatoins
• grouping (),[]
• method selector .
• uniary minus -
• not !
• mult/divide/mod *,/,%
• add/sub +,-
• relational <,<=,>,>=,==,!=
• and &&
• or ||
• assignment =