Java 顺序表-两个有序表的合并

桃扇骨 2022-11-21 06:55 229阅读 0赞

两个升序顺序表合并成升序表，主要涉及两个对象的互操作  
（1）SeqList merge1(SeqList L1,SeqList L2); —此种方式最简单  
（2）SeqList merge2(SeqList L); —此种方式较常用  
（3）void merge3(SeqList L); —此种方式最常用

import java.util.Scanner;
    class SeqList{
         //顺序表=数组+表长
    	int [] a;
    	int size;
    	int len;
    	SeqList(int x){
        
    		size = x;
    		a=new int [x];
    	}
    	void create(){
        
    		int x,i=0;
    		Scanner sc = new Scanner(System.in);
    		x = sc.nextInt();
    		while(x!=-1) {
        
    			a[i] = x;
    			i++;
    			x = sc.nextInt();
    		}
    		len = i;
    	}
    	void print() {
        
    		for(int i=0;i<len;i++)
    			System.out.print(a[i]+" ");
    		System.out.print("\n");
    	}
    	SeqList merge1(SeqList L1,SeqList L2) {
        
    		SeqList newL = new SeqList(50);
    		int i,j,k; i=0; j=0; k=0;
    		while(i<L1.len && j<L2.len) {
        
    			if(L1.a[i] < L2.a[j]) {
        
    				newL.a[k] = L1.a[i]; 
    				k++; i++;
    			}
    			else{
        
    				newL.a[k] = L2.a[j]; 
    				k++; j++;
    			}
    		}
    		while(i<L1.len) {
        
    			newL.a[k] = L1.a[i]; 
    			k++; i++;
    		}
    		while(j<L2.len) {
        
    			newL.a[k] = L2.a[j]; 
    			k++; j++;
    		}
    		newL.len = k;
    		return newL;
    	}
    	SeqList merge2(SeqList L1) {
        
    		//考虑调用情形：a.merge(b)，即a与b合并，即a实际上就是this
    	     //与merge1(L1,L2)相比，把所有的L2改成this
    		SeqList newL = new SeqList(50);
    		int i,j,k; i=0; j=0; k=0;
    		while(i<L1.len && j<this.len) {
        
    			if(L1.a[i] < this.a[j]) {
        
    				newL.a[k] = L1.a[i]; 
    				k++; i++;
    			}
    			else{
        
    				newL.a[k] = this.a[j]; 
    				k++; j++;
    			}
    		}
    		while(i<L1.len) {
        
    			newL.a[k] = L1.a[i]; 
    			k++; i++;
    		}
    		while(j<this.len) {
        
    			newL.a[k] = this.a[j]; 
    			k++; j++;
    		}
    		newL.len = k;
    		return newL;
    	}
    	void merge3(SeqList L1) {
        
    		//考虑调用情形：a.merge(b)，即a与b合并，即a实际上就是this
    	    //与merge1(L1,L2)相比，把所有的L2改成this
    		int [] x = new int [100];
    		int i,j,k; i=0; j=0; k=0;
    		while(i<L1.len && j<this.len) {
        
    			if(L1.a[i] < this.a[j]) {
        
    				x[k] = L1.a[i]; 
    				k++; i++;
    			}
    			else{
        
    				x[k] = this.a[j]; 
    				k++; j++;
    			}
    		}
    		while(i<L1.len) {
        
    			x[k] = L1.a[i]; 
    			k++; i++;
    		}
    		while(j<this.len) {
        
    			x[k] = this.a[j]; 
    			k++; j++;
    		}
    		L1.a = x;
    		L1.len = k;
    	}
    }
    
    class App{
        
    	public static void main(String [] args) {
        
    		SeqList  a = new SeqList(10);
    		SeqList  b = new SeqList(10);
    		System.out.println("请输入一组数，以-1结束：");
    		a.create();
    		a.print();
    		System.out.println("请输入一组数，以-1结束：");
    		b.create();
    		b.print();
    //		调用 SeqList merge1(SeqList L1,SeqList L2)
    //		SeqList c = a.merge1(a,b);
    
    //		调用 SeqList merge2(SeqList L1)
    //		SeqList c = a.merge2(b);
    //		c.print();
    		
    //		调用 void merge3(SeqList L1)
    		a.merge3(b);
    		b.print();
    	}
    }

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