java括号有效代码 java代码括号报错的原因
Java中实现判断括号是否有效的方法，实用代码
public static void main(String args[]){ String[] text={"一（1）","二（2）","三（3）","四（四）"}; for(String input:text){ if(check(input)){ System.out.println(input); } } } public static boolean check(String input){ return Pattern.matches("^[\u4e00-\u9fa5]+(\\(\\d+\\)|\\（\\d+\\）)$", input); }
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写一个java类,输出6对括号的所有有效组合
public class BracePair {
public BracePair()
{
int cnt = 6;
char[] array = new char[2*cnt];
print_pare(cnt, cnt, array, 0);
}
void print_pare(int l, int r, char str[], int cnt){
if(l0 || rl) return;
if(l==0 r==0){
for(int i=0; icnt; ++i){
System.out.print(str[i]);
}
System.out.println(", ");
}
else{
if(l 0){
str[cnt] = '(';
print_pare(l-1, r, str, cnt+1);
}
if(r l){
str[cnt] = ')';
print_pare(l, r-1, str, cnt+1);
}
}
}
public static void main(String[] args)
{
new BracePair();
}
}
java 计算器代码带括号 求注释
//引入各种类文件
import java.awt.Button;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.Frame;
import java.awt.GridLayout;
import java.awt.Panel;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
//定义JsqFrame继承Frame
class JsqFrame extends Frame {
double d1, d2; //定义两个double类型的变量
int op = -1; //定义两个int类型的变量
static TextField tf;//定义静态对象TextField
CalPanelL p1; //定义CalPanelL对象
// Constructor构造方法
JsqFrame() {
//以下设置属性
super("计算器");
setLayout(new FlowLayout());
setResizable(false);
setSize(250, 250);
tf = new TextField(18);
tf.setEditable(false);
tf.setBackground(Color.lightGray);
tf.setForeground(Color.red);
tf.setFont(new Font("Arial", Font.BOLD, 16));
add(tf);
p1 = new CalPanelL();
add(p1);
setVisible(true);
// addWindowListener(new Wclose());
}
//添加按钮继承Button类
class CalButton extends Button {
CalButton(String s) {
//设置按钮属性
super(s);
setBackground(Color.WHITE); //设置颜色为白色
}
}
//定义显示器继承Panel类
class CalPanelL extends Panel {
CalButton a, c, b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, bPN, bPoint,
bAdd, bSub, bMul, bDiv, bL, bR, bLn, bEqual, bCE, bQuit;
CalPanelL() {
//设置显示器的属性
setLayout(new GridLayout(6, 4));
setFont(new Font("TimesRoman", Font.BOLD, 16));
a = new CalButton("");
c = new CalButton("");
b0 = new CalButton("0");
b1 = new CalButton("1");
b2 = new CalButton("2");
b3 = new CalButton("3");
b4 = new CalButton("4");
b5 = new CalButton("5");
b6 = new CalButton("6");
b7 = new CalButton("7");
b8 = new CalButton("8");
b9 = new CalButton("9");
bPN = new CalButton("+/-");
bPoint = new CalButton(".");
// 设置按钮
bAdd = new CalButton("+");
bSub = new CalButton("-");
bMul = new CalButton("*");
bDiv = new CalButton("/");
bL = new CalButton("(");
bR = new CalButton(")");
bLn = new CalButton("ln");
bEqual = new CalButton("=");
bCE = new CalButton("CE");
bQuit = new CalButton("退出");
// 加入按钮
add(a);
add(c);
add(bCE);
bCE.addActionListener(new PressBCE());
add(bQuit);
bQuit.addActionListener(new PressBQuit());
add(b7);
b7.addActionListener(new PressB7());
add(b8);
b8.addActionListener(new PressB8());
add(b9);
b9.addActionListener(new PressB9());
add(bDiv);
bDiv.addActionListener(new PressBDiv());
add(b4);
b4.addActionListener(new PressB4());
add(b5);
b5.addActionListener(new PressB5());
add(b6);
b6.addActionListener(new PressB6());
add(bMul);
bMul.addActionListener(new PressBMul());
add(b1);
b1.addActionListener(new PressB1());
add(b2);
b2.addActionListener(new PressB2());
add(b3);
b3.addActionListener(new PressB3());
add(bSub);
bSub.addActionListener(new PressBSub());
add(b0);
b0.addActionListener(new PressB0());
add(bPoint);
bPoint.addActionListener(new PressBPoint());
add(bPN);
bPN.addActionListener(new PressBPN());
;
add(bAdd);
bAdd.addActionListener(new PressBAdd());
add(bL);
bL.addActionListener(new PressBL());
add(bR);
bR.addActionListener(new PressBR());
add(bLn);
bLn.addActionListener(new PressBLn());
add(bEqual);
bEqual.addActionListener(new PressBEqual());
}
}
//定义PressBAdd实现ActionListener
//大体的意思是按计算机按键的时出发的时间，设置按键的监听[加号的监听事件]
class PressBAdd implements ActionListener {
public void actionPerformed(ActionEvent e) {
try {
String d1 = tf.getText();
op = 0;
tf.setText(d1 + "+");
} catch (Exception ee) {
}
}
}
//定义PressBSub实现ActionListener
//大体的意思是按计算机按键的时出发的时间，设置按键的监听[减号的监听事件]
class PressBSub implements ActionListener {
public void actionPerformed(ActionEvent e) {
try {
String d1 = tf.getText();
op = 1;
tf.setText(d1 + "-");
} catch (Exception ee) {
}
}
}
//定义PressBMul实现ActionListener
//大体的意思是按计算机按键的时出发的时间，设置按键的监听[乘号的监听事件]
class PressBMul implements ActionListener {
public void actionPerformed(ActionEvent e) {
try {
String d1 = tf.getText();
op = 2;
tf.setText(d1 + "*");
} catch (Exception ee) {
}
}
}
//定义PressBDiv实现ActionListener
//大体的意思是按计算机按键的时出发的时间，设置按键的监听[除号的监听事件]
class PressBDiv implements ActionListener {
public void actionPerformed(ActionEvent e) {
try {
String d1 = tf.getText();
op = 3;
tf.setText(d1 + "/");
} catch (Exception ee) {
}
}
}
//定义PressBL实现ActionListener
//大体的意思是按计算机按键的时出发的时间，设置按键的监听[向左键的监听事件]
class PressBL implements ActionListener {
public void actionPerformed(ActionEvent e) {
try {
String d1 = tf.getText();
op = 3;
tf.setText(d1 + "(");
} catch (Exception ee) {
}
}
}
//定义PressBR实现ActionListener
//大体的意思是按计算机按键的时出发的时间，设置按键的监听[向右键的监听事件]
class PressBR implements ActionListener {
public void actionPerformed(ActionEvent e) {
try {
String d1 = tf.getText();
op = 3;
tf.setText(d1 + ")");
} catch (Exception ee) {
}
}
}
//定义PressBEqual实现ActionListener
//大体的意思是按计算机按键的时出发的时间，设置按键的监听[等号的监听事件]
class PressBEqual implements ActionListener {
public void actionPerformed(ActionEvent e) {
try {
Jsq jsq = new Jsq();
String s = tf.getText();
System.out.println(s);
while (s.indexOf("(") + 1 0 s.indexOf(")") 0) {
String s1 = jsq.caculateHigh(s);
System.out.println(s1);
s = s1;
}
String str = jsq.cacluteMain(s);
System.out.println(str);
tf.setText(String.valueOf(str));
} catch (Exception ee) {
}
}
}
/*
* 批量写吧
* 以下是按1、2、3等等的监听事件
* 还有清零的等等监听事件
*/
class PressBLn implements ActionListener {
public void actionPerformed(ActionEvent e) {
try {
double x = Double.parseDouble(tf.getText());
double y;
y = Math.log10(x);
tf.setText(y + "");
} catch (Exception ee) {
}
}
}
class PressBCE implements ActionListener {
public void actionPerformed(ActionEvent e) {
tf.setText("");
}
}
class PressBPN implements ActionListener {
public void actionPerformed(ActionEvent e) {
try {
String text = tf.getText();
if (text != "") {
if (text.charAt(0) == '-')
tf.setText(text.substring(1));
else if (text.charAt(0) = '0' text.charAt(0) = '9')
tf.setText("-" + text.substring(0));
else if (text.charAt(0) == '.')
tf.setText("-0" + text.substring(0));
}
} catch (Exception ee) {
}
}
}
class PressBPoint implements ActionListener {
public void actionPerformed(ActionEvent e) {
String text = tf.getText();
if (text.lastIndexOf(".") == -1)
tf.setText(text + ".");
}
}
class PressB0 implements ActionListener {
public void actionPerformed(ActionEvent e) {
String text = tf.getText();
tf.setText(text + "0");
}
}
class PressB1 implements ActionListener {
public void actionPerformed(ActionEvent e) {
String text = tf.getText();
tf.setText(text + "1");
}
}
class PressB2 implements ActionListener {
public void actionPerformed(ActionEvent e) {
String text = tf.getText();
tf.setText(text + "2");
}
}
class PressB3 implements ActionListener {
public void actionPerformed(ActionEvent e) {
String text = tf.getText();
tf.setText(text + "3");
}
}
class PressB4 implements ActionListener {
public void actionPerformed(ActionEvent e) {
String text = tf.getText();
tf.setText(text + "4");
}
}
class PressB5 implements ActionListener {
public void actionPerformed(ActionEvent e) {
String text = tf.getText();
tf.setText(text + "5");
}
}
class PressB6 implements ActionListener {
public void actionPerformed(ActionEvent e) {
String text = tf.getText();
tf.setText(text + "6");
}
}
class PressB7 implements ActionListener {
public void actionPerformed(ActionEvent e) {
String text = tf.getText();
tf.setText(text + "7");
}
}
class PressB8 implements ActionListener {
public void actionPerformed(ActionEvent e) {
String text = tf.getText();
tf.setText(text + "8");
}
}
class PressB9 implements ActionListener {
public void actionPerformed(ActionEvent e) {
String text = tf.getText();
tf.setText(text + "9");
}
}
class PressBQuit implements ActionListener {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
}
public void Js() {
String text = tf.getText();
tf.setText(text);
}
}
Java程序大佬，帮忙填下括号里的代码！！
public class Vehicle {
private double speed;
private int power;
public double getSpeed() {
return speed;
}
public void setSpeed(double speed) {
this.speed = speed;
}
// 将参数p的值赋值给成员变量power
public void setPower(int p){
this.power = p;
}
public int getPower() {
return power;
}
//将参数s的值与成员变量speed的和赋值给成员变量speed
public double speedUp(int s) {
return this.speed = s + this.getSpeed();
}
//将成员变量speed与参数d的差赋值给成员变量speed
public double speedDown(int d) {
if(this.getSpeed() d) {
return 0;
}
return this.speed = this.getSpeed() - d;
}
}
public class User {
public static void main(String[] args) {
// 每个对象都会提供一个默认的空构造方法。
Vehicle car1 = new Vehicle();
Vehicle car2 = new Vehicle();
car1.setPower(128);
car2.setPower(76);
System.out.println("car1的功率是："+car1.getPower( ) );
System.out.println("car2的功率是："+car2.getPower( ) );
//car1调用speedUp( )方法将自己的speed的值增加80
car1.speedUp(80);
//car2调用speedUp( )方法将自己的speed的值增加100
car2.speedUp(100);
System.out.println("car1的速度是："+car1.getSpeed( ) );
System.out.println("car2的速度是："+car2.getSpeed( ) );
car1.speedDown(10);
car2.speedDown(20);
System.out.println("car1目前的速度是："+car1.getSpeed( ) );
System.out.println("car2目前的速度是："+car2.getSpeed( ) );
}
}
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