Data Structures and the Java Collections Frameworks by William J. Collins

By William J. Collins

Rather than emphasizing the underlying arithmetic to get programmers to construct their very own facts buildings, Collins allows them to govern current buildings within the Java Collections Library. this enables them to profit via coding instead of via doing proofs. 23 lab initiatives and countless numbers of programming examples are built-in in the course of the pages to construct their instinct. The technique this booklet takes is helping programmers quick study the strategies that underlie information buildings.

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For example, names [0] = "Cromer"; will store a reference to “Cromer” at the zeroth entry in the array (referenced by) names. The size of an array is fixed once the array has been created, but the size need not be determined at compile-time. nextInt(); String [ ] names = new String [n]; ... When the processInput method is executed at run time, names will be assigned a reference to an array of n string references, all of which are initialized to null. An array is an object, even though there is no corresponding class.

Println (s); } // method run public void flip (String t) { t = new String ("no"); } // method flip } // class Immutable The output will be “yes”. The flip method constructed a new String object, but did not affect the original String object referenced by s. 3 shows the relationship between the argument s and the parameter t at the start of the execution of the call to the flip method. 4 shows the relationship between s and t at the end of the execution of the method call. 4 The relationship between the argument s and the parameter t at the end of the execution of the flip method in the class Immutable Some built-in classes are mutable.

The character ‘f’—called a “flag”—signifies that grossPay will be printed with fractional digits. 2”—the “width” and “precision”—signifies that there will be at least one digit (even if it is a zero) to the left of the decimal point, and exactly two digits (rounded) to the right of the decimal point. 57 If there are additional values to be printed, the format for each value starts with a percent sign inside the format. 2f", name, grossPay); The ‘s’ flag indicates a string. 57 We can ensure there will be a comma between the hundreds and thousands digits by including the comma flag, ‘,’.

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