I have simple math example Add, Substract, Divide and Multiply and using variable as double and want answer should be in two decimal point if I use decimals to add substract divide or multiply.
private void jButton_addActionPerformed(java.awt.event.ActionEvent
evt) {
double First = Double.parseDouble(jTextField1.getText());
// Read the Second number
double Second = Double.parseDouble(jTextField2.getText());
// Set the Result
double Result = First + Second;
jLabel4.setText(String.valueOf(Result));
}
private void jButton_substractActionPerformed
(java.awt.event.ActionEvent evt)
{
double First = Double.parseDouble(jTextField1.getText());
// Read the Second number
double Second = Double.parseDouble(jTextField2.getText());
// Set the Result
double Result = First - Second;
jLabel4.setText(String.valueOf(Result));
}
private void jButton_MultiplyActionPerformed
(java.awt.event.ActionEvent evt)
{
double First = Double.parseDouble(jTextField1.getText());
// Read the Second number
double Second = Double.parseDouble(jTextField2.getText());
// Set the Result
double Result = First * Second;
jLabel4.setText(String.valueOf(Result));
}
private void jButton_divideActionPerformed(java.awt.event.ActionEvent
evt) {
double First = Double.parseDouble(jTextField1.getText());
// Read the Second number
double Second = Double.parseDouble(jTextField2.getText());
// Set the Result
double Result = First / Second;
jLabel4.setText(String.valueOf(Result));
}
How to get result rounded to two decimal Points like 12.38 instead of 12.379999
使用setRoundingMode告诉它您想要多少个小数点。
You can do this by
double round = Math.round(number * 100.0) / 100.0;
where number
is your decimal number
To break it down -
double number = 3.14159;
number = Math.round(number * 100);
number = number/100;
The output will be 3.14
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