double?m?=?78.5;
//將基本類型轉(zhuǎn)換為字符串
//String?str1?=?Double.toString(m);
????????//String?str1?=?String.valueOf(m);
????????String?str1?=?""+m;
????????
/*System.out.println("m?轉(zhuǎn)換為String型后與整數(shù)20的求和結(jié)果為：?"+(Double.parseDouble(str1)+20));*/
????????/*System.out.println("m?轉(zhuǎn)換為String型后與整數(shù)20的求和結(jié)果為：?"+((double)Double.valueOf(str1)+20));*/
System.out.println("m?轉(zhuǎn)換為String型后與整數(shù)20的求和結(jié)果為：?"+(Double.valueOf(str1).doubleValue()+20));
????????
String?str?=?"180.20";
????//?將字符串轉(zhuǎn)換為基本類型
//Double?a?=?Double.valueOf(str);
????????//Double?a?=(Double)Double.parseDouble(str);
????????Double?a?=new?Double(Double.parseDouble(str));
System.out.println("str?轉(zhuǎn)換為double型后與整數(shù)20的求和結(jié)果為：?"+(a+20));
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