练习

九九乘法表

public static void main(String[] args){

for (int i = 1; i < 10; i++) {
System.out.println("");
for (int j = 1; j < i + 1; j++) {
System.out.print(i + "*" + j + "=" + i * j + " ");
}
}
System.out.println("");
for (int i = 1; i < 10; i++) {
System.out.println("");
for (int j = 1; j < i + 1; j++) {
System.out.print(j + "*" + i + "=" + i * j + " ");
}
}
System.out.println("");
System.out.println("");
for (int i = 9; i > 0; i--) {
System.out.println("");
for (int j = 1; j < i + 1; j++) {
System.out.print(j + "*" + i + "=" + i * j + " ");
}
}

}

冒泡排序

public static void main(String[] args){
int[] a = {41,12,69,41,55,1,14,65,2};
for (int i = 1; i <= a.length; i++) {
for (int j = 0; j < a.length - 1; j++) {
if(a[j] > a[j + 1]){
int b = a[j];
a[j] = a[j+1];
a[j+1] = b;
}
}
}
for (int i = 0; i < a.length; i++) {
System.out.print(a[i] + " ");
}
}