The toString() method is used to return a Number object value represented by a string.
If the method uses a native data type as a parameter, the String object value of the native data type is returned.
If the method has two parameters, returns the string representation of the first parameter in the base specified by the second parameter.
Specific method:
The first way is through the ToString() method, Double is a wrapper class
String s1 = Double.toString(dou1);
The second way is through the valueof() method, essentially Or call the toString() method
String s2 = String.valueOf(dou1);
The third method is not to use the packaging class
String s3 =""+dou1;
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Specific example:
package com.obge.contr; public class ChangeNtoS { public static void main(String[] args) { //定义一个变量并赋值，，变量和常量：一个可以变化，一个不能变换，使用final定义的就不能变换 double dou1 = 3.222; int i1= 22; float f1= 2.1f; byte b1 =1; long l1 =1; short st1 =22; // 将double 类型转换为String 类型 知道 包装类和 基本数据类型，Java 5 增加了自动装箱、拆箱机制， //第一种方式通过ToString() 方法, Double 就是一个包装类 String s1 = Double.toString(dou1); String sf1 = Float.toString(f1); String si1 = Integer.toString(i1); String sb1 = Byte.toString(b1); String sl1 = Long.toString(l1); String sst1 = Short.toString(st1); //第二种方式是通过valueof() 方法, 本质上还是调用 toString() 方法 String s2 = String.valueOf(dou1); //第三种没有借助包装类 String s3 =""+dou1; System.out.println("转换前："); System.out.println(dou1+"的类型是："+getType(dou1)); System.out.println("转换后："); System.out.println(s1+"的类型是："+getType(s1)); System.out.println(s2+"的类型是："+getType(s2)); System.out.println(s3+"的类型是："+getType(s3)); System.out.println(i1+"转换前的类型是："+getType(i1)+"转换后的类型是："+getType(si1)); } //获取变量类型方法 public static String getType(Object o){ //调用该方法返回变量类型 getClass()方法 return o.getClass().toString(); } }
Output results:
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