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                            ### 常用API

* getURLs\(\)子類URLClassLoader方法，用于獲取系統環境路徑
* JDK對Short、Integer、Byte的緩存
  ```
  // Integer緩存(range [-128, 127] must be interned(JLS7 5.1.7))
      Integer a = new Integer(10);
      Integer b = 10;
      Integer c = Integer.valueOf(10);
      Integer d = new Integer("10");

      System.err.println(a == b);
      System.err.println(b == d);
      System.err.println(a == d);
      System.err.println(b == c);
      out =====>
      false
      false
      false
      true
  ```




                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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