Java编程float转换为String并保留n位小数

1.将float转换为String

1.1。Float.toString（float f）

float pi = 3.1415927f;
         
String piString = Float.toString(pi);
 
System.out.println(piString);

$titl(输出)
3.1415927

1.2。String.valueOf（float f）

String.valueOf（）方法定义

public static String valueOf(float f)
{
    return Float.toString(f);
}

String.valueOf（）示例

float pi = 3.1415927f;
         
String piString = String.valueOf(pi);
 
System.out.println(piString);

$title(输出)
3.1415927

2.将float格式化为String

float pi = 3.1415927f;
 
NumberFormat formatter = new DecimalFormat("0.00");
 
String formmatedFloatValue = formatter.format(pi);
 
System.out.println( formmatedFloatValue );
 
System.out.println(formatter.format(1.1));
 
System.out.println(formatter.format(1.123));

$title(输出)
3.14
1.10
1.12

3.将String转换为float

String piString = "3.1415927";
 
float pi = Float.parseFloat(piString);
 
System.out.println(pi);

$(输出)
3.1415927

Java编程 float

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