不会写了。乱写了 int line=7;
 for (int i = 1; i < line; i++) {
 for (int j = 1; j <i+1; j++) {
 System.out.print("*");
 }
 for (int j = 2*(line-2-i)+1; j>0; j--) {
 System.out.print(" ");
 }
 if(i==6){
 for (int j = 1; j <i; j++) {
 System.out.print("*");
 }
 }else{
 for (int j = 1; j <i+1; j++) {
 System.out.print("*");
 }
 }
System.out.println();
}

解决方案 »

  1.   


    public class Test4 { public static void main(String[] args) {

    int line = 9;

    for(int i = 0, r = line * 2 - 1; i < line; i++) {

    for(int j = 0; j < r; j++) {

    if(j <= i || j >= r - i - 1) {
    System.out.print('*');
    } else {
    System.out.print(' ');
    }

    }

    System.out.println();

    }

    }}
      

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