Java2007-09-02
ThreadGroup Sample in Java
Thread groups offer a convenient way to manage groups of threads as a unit. This is particularly valuable in situations in which you want to suspend and resume a number of related
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Java2007-09-02
Executing other system commands and programs from a Java Program
In safe environments, you can use Java to execute other heavyweight processes (that is, programs) on your multitasking operating system. Several forms of the exec() method allow yo
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Using totalMemory() and freeMemory() in Java
Although Java provides automatic garbage collection, sometimes you will want to know how large the object heap is and how much of it is left. You can use this information, for exam
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Converting Numbers to and from Strings using Java
One of the most common programming chores is converting the string representation of a number into its internal, binary format. Fortunately, Java provides an easy way to accomplish
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Understanding isInfinite() and isNaN() in Java
Float and Double provide the methods isInfinite() and isNaN(), which help when manipulating two special double and float values. These methods test for two unique values defined by
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Using toLowerCase() and toUpperCase() in Java
The method toLowerCase() converts all the characters in a string from uppercase to lowercase. The toUpperCase() method converts all the characters in a string from lowercase to upp
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Java2007-09-02
valueOf() in Java
The valueOf() method converts data from its internal format into a human-readable form. It is a static method that is overloaded within String for all of Java's built-in types, so
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substring() in Java
You can extract a substring using substring(). It has two forms.
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indexOf() and lastIndexOf() in Java
These two methods are overloaded in several different ways. In all cases, the methods return the index at which the character or substring was found, or 1 on failure.
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How to use equals() and equalsIgnoreCase() in Java
The comparison using equals() is case-sensitive. To perform a comparison that ignores case differences, call equalsIgnoreCase(). When it compares two strings, it considers A-Z to b
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How to use regionMatches() in Java
The regionMatches() method compares a specific region inside a string with another specific region in another string. There is an overloaded form that allows you to ignore case in
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startsWith() and endsWith() in Java
String defines two routines that are, more or less, specialized forms of regionMatches(). The startsWith() method determines whether a given String begins with a specified string.
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