java - Java 中的 toPlainString() 和 toString() 有什么区别？

Question

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Answer 1

Java toString() 方法:

If you want to represent any object as a string, toString() method comes into existence.The toString() method returns the string representation of the object.

示例:

Student s1 = new Student(101,"Raj","lucknow");  
Student s2 = new Student(102,"Vijay","ghaziabad");  

System.out.println(s1);//compiler writes here s1.toString()  
System.out.println(s2);//compiler writes here s2.toString()  

//Output : 101 Raj lucknow
           102 Vijay ghaziabad

Java toPlainString() 方法:

The java.math.BigDecimal.toPlainString() returns a string representation of this BigDecimal without an exponent field.

示例:

MathContext mc = new MathContext(3); // 3 precision
BigDecimal bigDecimal = new BigDecimal("1234E+4", mc);
// Assign the plain string value of bigDecimal to s
String plainString = bigDecimal.toPlainString();

String str = "Plain string value of " + bigDecimal + " is " + plainString;

// print s value
System.out.println( str );

//Output : Plain string value of 1.23E+7 is 12300000