java类库详细讲解

				
				
				
				Getting and Setting the Value of a System Property
				(Java Developers Almanac Example)
				
				
				
				
				
				
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				The Java Developers Almanac 1.4
				
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				    List of Packages
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				    java.lang
				         [58 examples]
				        
				        >
				        System Properties
				             [3 examples]
				            
				
				  
				    e86.  
				    Getting and Setting the Value of a System Property
				
				
				
				    // Get a system property
				    String dir = System.getProperty("user.dir");
				    
				    // Set a system property
				    String previousValue = System.setProperty("application.property", "newValue");
				
				
				
				
				             Related Examples
				        
				
				
				
				
				e87. 
				    Setting the Value of a System Property from the Command Line
				
				
				
				e88. 
				    Listing All System Properties
				
				
				
				
				
				
				
				
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				    Arrays
				  
				
				
				    Assertions
				  
				
				
				    Classes
				  
				
				
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