你如何将一根绳子剪成所需的尺寸？

Question

有问题的方法如下：

Public static String cut (String s, int size){
    Return "";
}

Answer 1

切断字符串JRadioButton button1 = new JRadioButton("M"),button2 = new JRadioButton(("F")); button1.setHorizontalAlignment(SwingConstants.CENTER); button2.setHorizontalAlignment(SwingConstants.CENTER); ButtonGroup bgroup1 = new ButtonGroup(); bgroup1.add(button1); bgroup1.add(button2); JPanel radiobuttonpanel = new JPanel(); BoxLayout radiobuttonpanellayout = new BoxLayout(radiobuttonpanel, BoxLayout.X_AXIS); radiobuttonpanel.setLayout(radiobuttonpanellayout); radiobuttonpanel.add(button1); radiobuttonpanel.add(button2); panel4.add(radiobuttonpanel); 。

如何使用的示例：

String.substring()

在你的情况下，它将是：

"hamburger".substring(4, 8) returns "urge"
"smiles".substring(1, 5) returns "mile"

文档：https://docs.oracle.com/javase/7/docs/api/java/lang/String.html#substring(int,%20int)