j02050306.java

经典java教材《java完美经典》一书中源码的完全收集

import java.lang.*;

class j02050306
{
  public static void main(String para[])
  {
		try
		{
      boolean Bool1 = Boolean.valueOf("fish").booleanValue();   //先 String 转成 Boolean 对象，再取得它的 boolean 值
                      //不是 "true" (但大小写不论)，就为 false
      System.out.println("Bool1 = " + Bool1);
      Bool1 = Boolean.valueOf("True").booleanValue();
      System.out.println("Bool1 = " + Bool1);
      
      String Str1 = "126";		  
      byte B1 = Byte.parseByte("20");  //B1 = 20		  
      System.out.println("B1 = " + B1);
      short S1 = Short.parseShort(Str1);  //S1 = 126
		  System.out.println("S1 = " + S1);
		  int I1 = Integer.parseInt(Str1);   //I1 = 126
		  System.out.println("I1 = " + I1);		   
		  long L1 =Long.parseLong(Str1);   //L1 = 126
		  System.out.println("L1 = " + L1); 
		  float F1 = Float.parseFloat(Str1);  //F1 = 126.0
		  System.out.println("F1 = " + F1); 
		  double D1 = Double.parseDouble(Str1);  //D1 = 126.0
		  System.out.println("D1 = " + D1); 
		  
		  S1 = Short.parseShort("332.81"); 
		              //字义不属于 0 ~ 65535，产生例外
		  System.out.println("S1 = " + S1); //在例外之后不会执行		  
    }
    catch(NumberFormatException Obj)
    { 
    	System.out.println("NumberFormatException happens");
    }
  }
}