public?class?BracePair?{
public?BracePair()
{
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();
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();
System.out.println("car1的功率是:"◆car1.getPower( ) );
System.out.println("car1的速度是:"◆car1.getSpeed( ) );
car1.speedDown(10);
System.out.println("car1目前的速度是:"◆car1.getSpeed( ) );
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